Bug 2561479 (CVE-2026-116804) - CVE-2026-116804 dompurify: DOMPurify: Cross-site scripting via sanitization bypass in attached shadow roots
Summary: CVE-2026-116804 dompurify: DOMPurify: Cross-site scripting via sanitization b...
Keywords:
Status: NEW
Alias: CVE-2026-116804
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-26 23:22 UTC by OSIDB Bzimport
Modified: 2026-10-26 23:31 UTC (History)
0 users

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Description OSIDB Bzimport 2026-10-26 23:22:16 UTC 
DOMPurify from 3.4.4 before 3.4.17 contains a SAFE_FOR_TEMPLATES bypass that lets attackers preserve template expressions in attached shadow roots when using RETURN_DOM, RETURN_DOM_FRAGMENT, or IN_PLACE modes. Attackers can split expressions across text nodes separated by disallowed elements, which merge after removal and are evaluated by downstream template engines for cross-site scripting.
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