Individual skill
performing-xs-search-attacks
Performing XS-Search / XS-Leaks attacks that extract cross-origin information through side channels — using inclusion methods (frames, pop-ups, HTML elements, fetch) and leak techniques (event handlers, timing, error events, global limits like connection-pool and event-loop, CORB, postMessage, Performance API) to distinguish two states of a victim page and exfiltrate secrets. Activates when assessing cross-origin information disclosure, search endpoints, or state-dependent responses.
internal/tools/skills/data/web-application-security/performing-xs-search-attacks/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- Yes
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,329
- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- 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
- xs-search Declared skill tag
- xs-leaks Declared skill tag
- owasp Declared skill tag
- web-security Declared skill tag
- security Derived category
- testing Derived category
- security-application Derived category
Files and excerpt
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SKILL.mdcore · 11,654 bytes
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# Performing XS-Search Attacks
## When to Use
- During authorized assessments where a cross-origin page returns state-dependent responses (search results, auth state, presence of data)
- When a search/filter endpoint reflects whether a query matched (oracle for char-by-char exfiltration)
- When the target lacks framing protection (no XFO/CSP frame-ancestors) or COOP/CORP and can be embedded or popped
- When responses vary by status code, content length, headers, redirects, or processing time
- When evaluating the effectiveness of XS-Leak defenses (SameSite, COOP, CORP, Fetch Metadata, Cache Partitioning)
## Prerequisites
- **Authorization**: Engagement scope covering cross-origin information disclosure and a victim test account
- **Attacker-controlled origin**: A web page you host to deliver the exploit and receive leaked bits