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Security Consulting — Private Limited

Security before
adversaries arrive

Rexscot delivers enterprise-grade penetration testing, VAPT assessments, and application security consulting for organisations that cannot afford to be breached.

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Web Application Security
API Security Testing
VAPT
Mobile Security
Desktop Application Testing
Secure Code Review
Security Consulting
Threat Modelling
Web Application Security
API Security Testing
VAPT
Mobile Security
Desktop Application Testing
Secure Code Review
Security Consulting
Threat Modelling

Our Discipline

Precise, human-led security testing. Every engagement.

We believe that meaningful security can only come from people who think like attackers. Automation has its place; judgment does not scale.

40+
Applications Tested
200+
Vulnerabilities Found
100%
Satisfaction
I
Human-led, not scanner-driven
Every engagement is conducted by experienced practitioners. We use tooling to accelerate reconnaissance — not to replace the analyst's mind.
II
Reports that drive remediation
Technical depth for developers. Executive clarity for leadership. Every finding includes CVSS scoring, working proof-of-concept, and step-by-step remediation.
III
Confidentiality as a first principle
Mutual NDAs precede every technical conversation. Your architecture, your findings, and your vulnerabilities remain strictly between us.
IV
Accountability through retesting
We do not consider an engagement complete until every finding has been remediated and independently verified. Closure is a shared responsibility.

Capabilities

What we test

Rexscot conducts security assessments across every layer of the modern application stack — from network perimeter to business logic.

  • Web Application Penetration Testing
    01
    OWASP Top 10, business logic, authentication, session management, client-side vulnerabilities
  • API Security Testing
    02
    REST, GraphQL, WebSocket — BOLA, JWT analysis, rate limiting, mass assignment
  • VAPT
    03
    Comprehensive vulnerability assessment and penetration testing — internal, external, web and mobile scope
  • Mobile Application Security
    04
    Android static and dynamic analysis — storage, communication, API layer, reverse engineering
  • Desktop Application Testing
    05
    Windows and Electron applications — local privilege escalation, insecure storage, update mechanism review
  • Security Consulting
    06
    Architecture review, threat modelling, secure code review, risk assessment

Engagement Process

How every
engagement unfolds

A structured, seven-phase process that ensures nothing is missed from initial reconnaissance through to verified remediation.

Phase 01
Reconnaissance
Passive and active information gathering across all declared scope.
Phase 02
Attack Surface Mapping
Enumeration of entry points, endpoints, and potential attack vectors.
Phase 03
Vulnerability Discovery
Systematic discovery using manual testing augmented by targeted tooling.
Phase 04
Exploitation & Validation
Manual exploitation of confirmed vulnerabilities with working proof-of-concept.
Phase 05
Risk Assessment
CVSS-based scoring contextualised against real business impact.
Phase 06
Report Delivery
Executive summary and full technical report with remediation guidance.
Phase 07
Remediation & Retest
Available for developer queries. Independent verification once fixes are applied.

Why Rexscot

Principles that shape
every engagement

01
Human Expertise
Every assessment is conducted by practitioners, not configured in a dashboard. Human judgment finds what automated scans miss.
02
AI-Assisted Reconnaissance
Agentic AI workflows surface attack surfaces faster and more thoroughly — giving our analysts more time for deep manual analysis.
03
Actionable Reporting
Reports written for two audiences simultaneously — technical teams who need to fix, and leadership who need to decide.
04
NDA-First Engagement
A mutual NDA is standard practice, signed before any discussion of your systems, architecture, or infrastructure begins.
05
Verified Remediation
We retest after fixes are applied. We do not consider an engagement closed until every confirmed vulnerability is independently verified as resolved.
06
Responsive Communication
Status updates throughout the engagement. Developer queries answered during remediation. No period of silence once work has begun.

Report Quality

Deliverables that
drive action

Every report includes an executive summary for leadership, a complete technical report for engineering teams, CVSS-scored findings, working proof-of-concept code, and step-by-step remediation guidance.

CriticalSQL Injection — /api/users authentication bypass
HighBroken Object Level Authorisation (IDOR)
HighJWT Algorithm Confusion — RS256 to HS256
MediumReflected XSS via unsanitised search parameter
MediumInsecure Direct Object Reference on document API
Request Sample Report
rexscot-pentest-report.txt
# Rexscot — Engagement Report
# Client: [REDACTED] | Classification: CONFIDENTIAL
 
engagement_type: Web Application VAPT
scope: app.client.com + /api/*
duration: 5 business days
methodology: OWASP Testing Guide v4.2
 
findings_summary:
  critical: 2
  high: 4
  medium: 7
  low: 5
 
overall_risk: CRITICAL (CVSS 9.1)
retest_status: Pending remediation
 
# Executive summary: included
# Proof of concept: included
# Remediation guide: included
# NDA: active

Client Feedback

What our clients say

All client reviews
"Professional engagement throughout. The reporting was detailed, the communication was clear, and every finding was explained with enough context for our engineering team to act on it immediately."
Wistaar
Technology Platform
Web Application VAPT
"The team found critical vulnerabilities in our trading API that had gone undetected. Remediation guidance was practical and the retest confirmed everything was properly resolved."
OpenTradex
Financial Technology Platform
API Security Assessment

Onboarding

From first contact to
secured system

A structured onboarding process that removes ambiguity from the very first conversation.

Begin Engagement
  • 01
    Initial Contact
    Submit your enquiry. We respond within one business day to discuss your requirements at a high level.
  • 02
    NDA and Agreement
    A mutual non-disclosure agreement is executed before any technical discussion or system details are shared.
  • 03
    Scope Definition
    Together we define the exact scope, timeline, rules of engagement, and testing methodology for the assessment.
  • 04
    Security Testing
    The engagement runs to the agreed schedule. Regular status updates are provided throughout the testing period.
  • 05
    Report Delivery
    Technical and executive reports delivered securely, accompanied by a debrief call to walk through findings.
  • 06
    Remediation Support
    Our team remains available to answer developer questions as your engineers apply the recommended fixes.
  • 07
    Retest and Sign-off
    Once fixes are applied, we independently verify each remediation. A retest report is issued upon completion.

Standards and Ethics

Security conducted
responsibly

01
OWASP Methodology
All web assessments are conducted in accordance with the OWASP Testing Guide v4.2.
02
Responsible Disclosure
Findings are reported through coordinated disclosure with clear timelines and no unilateral publication.
03
NDA by Default
Mutual NDA is executed at the beginning of every engagement, before any technical discussion.
04
Risk-Based Prioritisation
Findings are triaged by real business impact, not raw CVSS scores in isolation.
05
Data Handling
All client data is encrypted in transit and at rest, then deleted per the terms agreed at engagement start.
06
Verified Remediation
No engagement is formally closed until retesting confirms all critical and high findings are resolved.

Pricing

Every assessment is scoped individually

Custom Quotation
No two assessments share the same scope, complexity, or timeline. We price each engagement based on what your business actually requires — no fixed packages, no unnecessary overhead.
Scope and asset count Application complexity Testing depth Timeline requirements Retest cycles
Request a Quotation

Common Questions

Frequently asked

A penetration test is an authorised, simulated attack against your systems designed to identify and safely exploit vulnerabilities before real adversaries do. Unlike automated scanning, a pentest involves human expertise and lateral thinking to uncover complex, business-logic flaws that tools cannot detect.
VAPT — Vulnerability Assessment and Penetration Testing — combines a systematic audit for known vulnerabilities with manual exploitation and validation. It provides both breadth (what exists) and depth (what can be exploited) of security coverage in a single structured engagement.
Duration depends on scope and complexity. A focused web application assessment typically requires three to seven business days. Comprehensive VAPT engagements or multi-application assessments may require two to four weeks. We agree on timelines during the scope definition phase.
Yes. Following report delivery, we remain available to answer developer questions and provide clarification as your engineering team applies the recommended fixes. Retesting is then conducted to independently confirm each vulnerability is resolved.
Yes. We work with startups, growth-stage companies, SMEs, and enterprises. For earlier-stage organisations, we offer focused, scope-controlled assessments that deliver maximum value relative to the investment.
A mutual NDA is standard practice at Rexscot, executed before any technical discussion or sharing of system details. This is not optional — it is how every engagement begins.
Yes. Retesting is included in every engagement. Once your team applies the recommended fixes, we verify each remediation independently and issue a retest report confirming the outcome.

Begin

Identify your vulnerabilities
before attackers do

No commitment required for an initial consultation. Tell us about your business and we will recommend the right assessment.

Book Consultation View All Services

Capabilities

Security testing across every layer of the modern stack

From perimeter to business logic, Rexscot conducts manual assessments across web, API, mobile, and desktop applications.

01 — Web Application

Web Application
Penetration Testing

Deep-dive manual testing against the OWASP Testing Guide — uncovering vulnerabilities that automated scanners cannot detect, including business logic and authentication flaws.

  • —
    OWASP Top 10 — full coverage
    All ten categories tested systematically using manual techniques.
  • —
    Business Logic Testing
    Abuse of application workflows, pricing manipulation, and privilege abuse scenarios.
  • —
    Authentication and Session Security
    Login bypass, session fixation, token predictability, and MFA circumvention.
  • —
    Injection and Client-Side Vulnerabilities
    SQLi, XSS, CSRF, SSRF, XXE, and file upload abuse testing.
Request Web Assessment
coverage-matrix.txt
# Web Application Test Coverage
 
A01: Broken Access Control [COVERED]
A02: Cryptographic Failures [COVERED]
A03: Injection [COVERED]
A04: Insecure Design [COVERED]
A05: Security Misconfiguration [COVERED]
A06: Vulnerable Components [COVERED]
A07: Auth Failures [COVERED]
A08: Software & Data Integrity [COVERED]
A09: Security Logging [COVERED]
A10: Server-Side Request Forgery [COVERED]
 
business_logic: COVERED
manual_testing: YES
poc_included: YES

02 — API Security

API Security Testing

Category
Authorisation
BOLA, BFLA, IDOR, scope bypass, horizontal and vertical privilege escalation across all endpoints.
Category
Authentication
JWT algorithm confusion, weak secrets, OAuth misconfigurations, token expiry and refresh issues.
Category
Data Exposure
Excessive data in responses, error leakage, sensitive field exposure, mass assignment vulnerabilities.
Category
Rate and Logic
Rate limiting bypass, GraphQL introspection abuse, injection via query parameters, and batching attacks.
Request API Assessment

03 — Mobile Security

Mobile Application
Security Testing

Android application assessments covering static analysis, dynamic testing, and backend API communication review.

Android
  • APK decompilation and static analysis
  • Insecure data storage — SQLite, SharedPreferences, external storage
  • Insecure communication and SSL pinning bypass
  • Dynamic instrumentation via Frida
  • Reverse engineering and binary analysis
Backend API Layer
  • Full API security review conducted alongside the mobile assessment
  • Authentication and session handling analysis
  • Access control across all mobile-facing endpoints
  • Token and key management review
  • Sensitive data exposure in API responses
Request Mobile Assessment

04 — Desktop

Desktop Application Testing

Windows and Electron application assessments — local privilege escalation, insecure credential storage, DLL hijacking, and update mechanism review.

  • Windows application security review
  • Electron — Node.js context isolation and IPC review
  • Local privilege escalation pathways
  • Insecure credential and key storage
  • Update mechanism integrity verification

05 — VAPT

Vulnerability Assessment and Penetration Testing

Comprehensive VAPT engagements covering your full attack surface — internal networks, external perimeter, web applications, and mobile — in a single structured programme.

External
Internet-facing assets and perimeter
Internal
Network infrastructure and systems
Web
Application layer assessment
Mobile
Android and API layer

Get Started

Not sure which assessment you need?

Tell us about your organisation and we will recommend the right engagement.

Speak with Us

About Rexscot

Making enterprise-grade security accessible to every serious business

Rexscot was founded with the conviction that thorough, human-led security testing should not be limited to organisations with eight-figure security budgets.

Our Story

We witnessed too many growing businesses treat security as a compliance checkbox rather than an operational requirement. Not because they were careless, but because serious testing felt inaccessible.

Rexscot was built to close that gap. We bring the same depth of security assessment that large enterprises receive to startups and scale-ups who carry equivalent exposure — often with less internal capacity to detect or respond to a breach.

Every engagement is conducted by practitioners who approach your systems the way an adversary would. Findings are communicated clearly enough for engineers to act on them and for leadership to understand what was at stake.

The Team

KS
Kaif Shaikh
Co-Founder and Principal Security Consultant
// Magician Slime
Application security specialist and offensive security researcher. Leads web application assessments, API security engagements, and the development of AI-assisted security workflows used in Rexscot's reconnaissance process.
Web Security API Pentesting AI-Assisted Recon Bug Hunting OWASP
MK
Musaddik Khan
Co-Founder and Security Researcher
// MK
Security researcher and penetration tester with broad expertise across network security, mobile application testing, and vulnerability research across diverse technology stacks. Leads VAPT engagements and infrastructure assessments.
Security Research Mobile Security VAPT Network Security Vulnerability Research

Mission and Vision

Mission

To proactively secure organisations through rigorous offensive security testing and actionable remediation guidance — converting discovered vulnerabilities into strengthened defences.

Vision

A digital ecosystem in which businesses of every scale can build and operate with confidence, knowing their security posture is continuously tested and genuinely resilient.

Core Values

What we stand for

01
Integrity
Transparency without exception. No inflated findings, no undisclosed scope changes.
02
Confidentiality
Your vulnerabilities, your architecture, your data — protected at every stage of every engagement.
03
Transparency
Clear, honest reporting. We explain what we found, what it means, and what to do about it.
04
Technical Excellence
Depth over breadth. Every finding is manually verified before inclusion in any report.
05
Continuous Development
The threat landscape does not stand still. Neither do we.

Ready to begin?

Contact us to discuss your requirements. No commitment for the initial consultation.

Get in Touch

Insights

Security knowledge, applied

Practical security guidance, methodology breakdowns, and vulnerability research from our team.

OWASP
OWASP Top 10 Explained: The Most Critical Web Application Risks
A practitioner's breakdown of the OWASP Top 10 — what each vulnerability is, how it is exploited, and what effective remediation looks like.
Kaif Shaikh8 min read — Coming Soon
Vulnerability Research
SQL Injection in 2024: Still Prevalent, Still Critical
Why SQL injection remains one of the most frequently exploited vulnerabilities, with real-world examples and a complete analysis of detection and prevention.
Musaddik Khan12 min read — Coming Soon
API Security
API Security Fundamentals: What Every Engineering Team Should Know
The most consequential API security failures — broken object-level authorisation, JWT vulnerabilities, and rate limiting gaps — explained with testing methodology.
Kaif Shaikh10 min read — Coming Soon
Methodology
Bug Bounty Methodology: A Structured Approach to Vulnerability Discovery
How effective vulnerability researchers structure their reconnaissance, testing, and reporting — a practical methodology guide for disciplined security work.
Musaddik Khan15 min read — Coming Soon
Engagement Process
What Happens During a VAPT Engagement
A transparent account of what a professional VAPT engagement involves — from scope definition to final retest sign-off.
Kaif Shaikh9 min read — Coming Soon
Secure Development
Secure Coding Practices That Prevent the Most Common Vulnerabilities
Practical secure coding principles that eliminate the most common vulnerability classes before they ever reach a security assessment.
Musaddik Khan11 min read — Coming Soon

Articles in preparation

Contact us to be notified when the first articles are published.

Get Notified

Client Reviews

Trusted by organisations that treat security seriously

Verified outcomes from completed engagements.

Web Application VAPT
Wistaar
Technology Platform
Findings
14
Vulnerabilities identified across authentication, session handling, and API layers.
"Professional engagement throughout. The reporting was detailed, the communication was clear, and every finding was explained with enough context for our engineering team to act immediately."
Wistaar
API Security Assessment
OpenTradex
Financial Technology Platform
Critical Findings
1
Critical authorisation bypass in the trading API. All findings remediated and verified.
"The team found critical vulnerabilities in our trading API that had gone undetected. Remediation guidance was practical and specific. Retesting confirmed everything was properly resolved."
OpenTradex
Request Your Assessment

Collaboration

We are open to working with people who take security seriously

Researchers, developers, startups, and organisations building in the security space — we are open to meaningful collaboration.

Who We Work With

01
Security Researchers
Vulnerability research, responsible disclosure coordination, and participation in structured security programmes.
02
Bug Hunters
Partnerships on bug bounty platforms and coordinated disclosure initiatives for shared client programmes.
03
Security Developers
Collaboration on security tooling, automation frameworks, and AI-assisted reconnaissance infrastructure.
04
Organisations
Security partnerships, joint assessments, and co-delivered programmes for enterprise and mid-market clients.
05
Startup Founders
Security-by-design integration for early-stage and growth-stage companies building their security posture from the ground up.
06
Students
Knowledge sharing, mentoring, and educational collaboration for those pursuing a serious path in cybersecurity.

Send an Enquiry

Tell us about your idea

Fill in the form and we will respond within one business day to discuss whether there is a productive fit.

Contact

Discuss your security requirements

Complete the form and we will respond within one business day. All enquiries are treated as confidential.

Primary Email
Business Email
Response Time
Within one business day
Location
India — Remote engagements worldwide
Confidentiality
All enquiries are treated as confidential. A mutual NDA is executed before any technical discussion begins.