Individual skill
exploiting-cookie-based-vulnerabilities
Testing and exploiting cookie-related weaknesses including attribute misconfiguration (SameSite, HttpOnly, Secure, Domain, Path), cookie prefix bypasses (__Host-/__Secure-), parser-discrepancy attacks (cookie smuggling, sandwich, $Version legacy parsing), cookie tossing/fixation, and weak/predictable or crypto-flawed (padding-oracle, ECB, CBC-MAC) session cookies. Activates when assessing session management, CSRF cookie defenses, or any flow that trusts cookie values.
internal/tools/skills/data/web-application-security/exploiting-cookie-based-vulnerabilities/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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Repository context
- Repository stars (not skill ratings)
- 1,323
- Repository last updated
- Nov 8, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- cookie-security Declared skill tag
- session-management Declared skill tag
- owasp Declared skill tag
- web-security Declared skill tag
- security Derived category
- testing Derived category
- security-application Derived category
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# Exploiting Cookie-Based Vulnerabilities
## When to Use
- During authorized assessments of session management, authentication, and CSRF cookie defenses
- When the app sets custom cookies that may encode sensitive data (user IDs, roles, encrypted blobs)
- When you control or find XSS on a subdomain (cookie tossing / fixation / prefix overwrite)
- When testing front-end/back-end parser discrepancies behind proxies, WAFs, or legacy Java/Python stacks
- When a session cookie looks Base64/hex-encoded and might be decodable, forgeable, or crypto-weak
## Prerequisites
- **Authorization**: Engagement scope covering session/auth testing with test accounts (attacker + victim)
- **Burp Suite**: Repeater for crafting raw `Cookie` headers and the CookiePrefixBypass.bambda custom action