{"id":"CVE-2026-116802","revision":"a8545b5de6804146aa4cf12645684c66","records":[{"revision":"a8545b5de6804146aa4cf12645684c66","observedAt":"2026-10-27T02:23:01.617+00:00","statement":{"source":"cve-program","id":"CVE-2026-116802","aliases":[],"title":"DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode","description":"DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to bypass the SMIL attributeName=href guard when PARSER_MEDIA_TYPE is application/xhtml+xml, because transformCaseFunc does not lowercase attribute names. Attackers can submit SVG with an animate or set element using attributeName=\"href\" and a javascript: entry in values to execute script when users click the sanitized link.","state":0,"publishedAt":"2026-10-26T23:05:34.457+00:00","modifiedAt":"2026-10-26T23:05:34.457+00:00","affected":[{"ecosystem":"Vendor product","name":"DOMPurify","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cure53\",\n                    \"product\": \"DOMPurify\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:npm/dompurify\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.4.17\"\n                        },\n                        {\n                            \"version\": \"3.4.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.1,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/cure53/DOMPurify/security/advisories/GHSA-c6gr-qvv4-5v3f","https://www.vulncheck.com/advisories/dompurify-before-3.4.17-xss-via-smil-attributename-guard-bypass-in-xhtml-mode"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116802","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-116802","identifiers":["CVE-2026-116802"]},"retained":false,"historicalAffected":[]}],"coverage":[]}