{"id":"CVE-2026-41240","revision":"6aabb641875943e5887adbe394f12034","records":[{"revision":"6aabb641875943e5887adbe394f12034","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41240","aliases":[],"title":"DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBID_ATTR fix)","description":"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.","state":0,"publishedAt":"2026-04-23T14:54:32.426+00:00","modifiedAt":"2026-04-23T17:21:30.547+00:00","affected":[{"ecosystem":"Vendor product","name":"DOMPurify","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cure53\",\n                    \"product\": \"DOMPurify\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.4.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"}],"references":["https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m","https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80","https://github.com/cure53/DOMPurify/releases/tag/3.4.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-41240","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-41240","identifiers":["CVE-2026-41240"]},"retained":false,"historicalAffected":[]}],"coverage":[]}