CVE-2026-65898

DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig

State: Published
Severity: 5.1 Medium
Published: Jul 23, 2026
Updated: Jul 23, 2026
Reserved: Jul 23, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	VulnCheck
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N	VulnCheck

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
DOMPurifycure53	before 3.4.11Affected 3.4.11Not affected

References

GitHub Security Advisory (GHSA-cmwh-pvxp-8882)vendor-advisory
VulnCheck Advisory: DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfigthird-party-advisory

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