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Commonmark (>= 0.6.0, < 2.9.1)

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high advisory

Stored XSS via Attribute Filter Bypass in league/commonmark

An XSS vulnerability in league/commonmark allows attackers to execute arbitrary JavaScript by prepending a U+000C form feed character to malicious attribute names, bypassing security filters in the AttributesExtension.

commonmark +1 xss web-vulnerability php supply-chain denial-of-service algorithmic-complexity
3t