CVE-2026-74793

Description

justhtml before 3.11.0 contains a cross-site scripting vulnerability where the default sanitizer bypasses event handler removal in selectedcontent projections. Attackers can inject SVG or MathML elements with event handlers that are cloned and reinserted into output without sanitization, enabling stored or reflected XSS attacks.

CVSS Vector

References

• https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-gjf2-f4jc-69xf
• https://www.vulncheck.com/advisories/justhtml-before-xss-via-selectedcontent-projection