CVE-2026-65898

EUVD-2026-48286
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
cure53dompurify
𝑥
< 3.4.11
CNA
Debian logo
Debian Releases
Debian Product
Codename
node-dompurify
bookworm
vulnerable
bookworm (security)
vulnerable
forky
3.4.12+dfsg-1
fixed
sid
3.4.12+dfsg-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882
https://www.vulncheck.com/advisories/dompurify-before-permanent-attribute-allowlist-pollution-via-setconfig
https://github.com/cure53/DOMPurify/security/advisories/GHSA-cmwh-pvxp-8882