DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode
Exact source revision recorded 27 Oct 2026 02:23:01 UTC. It does not establish the source's current position. Latest evidence.
cve-program · CVE-2026-116802
PublishedDOMPurify 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.
- Source published
- 26 Oct 2026 23:05:34 UTC
- Source modified
- 26 Oct 2026 23:05:34 UTC
- Observed here
- 27 Oct 2026 02:23:01 UTC
- Source terms
- CVE Program Terms of Use
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CVSS 4.0 · 5.1 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
CVSS 3.1 · 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N