CVE-2026-116802
DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | cure53 |
| Product | dompurify |
| Published | Oct 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
cure53 / DOMPurify
0 < 3.4.17
References
Credits
🔍 Koukyosyumei