dangling-markup-injection

Dangling markup injection exfiltrates data by injecting unclosed HTML tags that force the browser to load attacker-controlled URLs containing captured page content. It bypasses CSP script restrictions by leveraging browser parsing of unclosed markup rather than executing JavaScript.

Dangling markup injection is an HTML injection technique that captures secrets appearing after the injection point, like CSRF tokens and hidden form fields. It uses unclosed tags to consume subsequent page content and send it to an external endpoint.

Yes, you can use context- and browser-aware dangling tag vectors to steal pre-filled form values. You must select appropriate tag types and quote contexts to maximize consumed content across Chrome, Firefox, and Safari parsing differences.

Appropriate CSP bypasses for dangling markup include exploiting form-action, base-uri, or meta refresh directives. These allow the injected HTML to successfully redirect or submit captured data to your controlled endpoint despite active policy restrictions.

Chrome implements specific browser mitigations that block dangling markup exfiltration via img src tags. You must understand these browser-specific limitations and select alternative suitable dangling tags and quote contexts to successfully capture data.