CVE-2026-65898
HIGHDOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig
Title source: cnaDescription
DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitizeAttribute hook, allowing the hook to permanently mutate the shared allowlist. Attackers can register a hook that conditionally allows dangerous attributes like onerror for trusted elements, then submit untrusted content that inherits the polluted allowlist and executes event handlers as stored XSS.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-cmwh-pvxp-8882)
https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882
Third Party Advisory third-party-advisory
VulnCheck Advisory: DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig
https://www.vulncheck.com/advisories/dompurify-before-permanent-attribute-allowlist-pollution-via-setconfig
Scores
CVSS v3
7.2
EPSS
0.0017
EPSS Percentile
6.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (4)
cure53/DOMPurify
< 3.4.11
cure53/dompurify
< 3.4.11
cure53/DOMPurify
3.4.11
npm/dompurify
0 - 3.4.11npm
Published
Jul 23, 2026
Tracked Since
Jul 23, 2026