https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-09-29T19:43:58.345714+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-5751 CVE-2026-5751 — justhtml before 1.14.0 Mutation XSS via custom sanitization policies 2026-09-29T19:43:58.389007+00:00

Affected: EmilStenstrom justhtml

justhtml versions 1.13.0 and earlier contain a parser-differential / mutation cross-site scripting (mXSS) vulnerability when using a custom SanitizationPolicy that preserves foreign namespaces (e.g., drop_foreign_namespaces=False with allowlisted SVG/MathML elements or raw-text containers such as <style>). Specially crafted input can sanitize into markup that appears safe but becomes unsafe when re-parsed by a browser or another HTML parser, allowing markup injection. The default safe configuration (sanitize=True) is not affected. Fixed in 1.14.0.