CVE-2026-41240
MEDIUMDOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)
Title source: cnaDescription
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m
X_Refsource_Misc x_refsource_misc
https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80
X_Refsource_Misc x_refsource_misc
https://github.com/cure53/DOMPurify/releases/tag/3.4.0
Scores
CVSS v3
6.1
EPSS
0.0026
EPSS Percentile
17.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-183
CWE-79
Status
published
Products (3)
cure53/dompurify
< 3.4.0
cure53/DOMPurify
< 3.4.0
npm/dompurify
0 - 3.4.0npm
Published
Apr 23, 2026
Tracked Since
Apr 23, 2026