Individual skill
dangling-markup-injection
Dangling markup injection playbook. Use when HTML injection is possible but JavaScript execution is blocked (CSP, sanitizer strips event handlers, WAF blocks script tags) — exfiltrate CSRF tokens, session data, and page content by injecting unclosed HTML tags that capture subsequent page content.
skills/dangling-markup-injection/SKILL.md
Source commit 6fbf0bc8d5c71830d62543a308d8744606c43d7c
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- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
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- Repository last updated
- Sep 13, 2026
- License
- MIT
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# SKILL: Dangling Markup Injection — Exfiltration Without JavaScript
> **AI LOAD INSTRUCTION**: Covers dangling markup exfiltration via unclosed img/form/base/meta/link/table tags, what can be stolen (CSRF tokens, pre-filled form values, sensitive content), browser-specific behavior, and combinations with other attacks. Base models often overlook this technique entirely when CSP blocks scripts, jumping to "not exploitable" — dangling markup is the answer.
## 0. RELATED ROUTING
- [xss-cross-site-scripting](../xss-cross-site-scripting/SKILL.md) when full XSS is possible (no need for dangling markup)
- [csp-bypass-advanced](../csp-bypass-advanced/SKILL.md) when CSP blocks JS execution — dangling markup bypasses script restrictions
- [csrf-cross-site-request-forgery](../csrf-cross-site-request-forgery/SKILL.md) when dangling markup steals CSRF tokens for subsequent CSRF attacks
- [crlf-injection](../crlf-injection/SKILL.md) when CRLF enables HTML injection in HTTP response
- [web-cache-deception](../web-cache-deception/SKILL.md) when dangling markup + cache poisoning amplifies the attack
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