Bug 2506435 (CVE-2026-65903) - CVE-2026-65903 dompurify: DOMPurify: Security bypass allows injection of malicious content
Summary: CVE-2026-65903 dompurify: DOMPurify: Security bypass allows injection of mali...
Keywords:
Status: NEW
Alias: CVE-2026-65903
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2506999 2507000 2507001 2507003 2507005 2507010 2507012 2507013 2506998 2507002 2507004 2507006 2507007 2507008 2507009 2507011 2507014 2507015
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-23 14:01 UTC by OSIDB Bzimport
Modified: 2026-08-31 17:51 UTC (History)
105 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-07-23 14:01:55 UTC 
DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden tags to bypass FORBID_TAGS restrictions. Attackers can craft input containing tags listed in FORBID_TAGS that are also added via ADD_TAGS function, causing them to be retained in sanitized output.
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