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[HtmlSanitizer] Add support for securing links#60539
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Introduce `ensureSafeBlankTarget` to automatically add `rel="noopener noreferrer"` to `<a>` elements with `target="_blank"`, mitigating reverse tabnabbing risks. The `allowUnsafeBlankTargets` method allows opting out of this behavior if needed. Included tests validate the new functionality.
carsonbot commentedMay 25, 2025
Hey! Thanks for your PR. You are targeting branch "7.3" but it seems your PR description refers to branch "7.4". Cheers! Carsonbot |
/cc@tgalopin can you please check this PR? |
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Introduce
ensureSafeBlankTargetto automatically addrel="noopener noreferrer"to<a>elements withtarget="_blank", mitigating reverse tabnabbing risks.The
allowUnsafeBlankTargetsmethod allows opting out of this behavior if needed.ℹ️ Info: Modern browsers already consider
noopenerevent if missing. However the presence of therelattribute is still considered as [a good practice](https://cheatsheetseries.owasp.org/cheatsheets/HTML5_Security_Cheat_Sheet.html#tabnabbing) by the OWASP.
⚠ Warning: I modified
Node::setAttributeto allow overwriting existing attributes. I might have missed the reason for the commentAlways use only the first declaration (ease sanitization).⚠ Warning: The logic is implemented in
DomVisitor. It works, however I am wondering if an abstraction is needed.