CVE-2026-65902 (GCVE-0-2026-65902)

Vulnerability from cvelistv5 – Published: 2026-07-23 13:16 – Updated: 2026-07-24 21:35
VLAI
Title
DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags
Summary
DOMPurify before 3.4.7 (affected versions <= 3.4.5) passes direct references to the module-level DEFAULT_ALLOWED_TAGS and DEFAULT_ALLOWED_ATTR sets to the uponSanitizeElement and uponSanitizeAttribute hooks via data.allowedTags / data.allowedAttributes when sanitize is called without an explicit cfg.ALLOWED_TAGS / cfg.ALLOWED_ATTR array. A hook that mutates these fields permanently widens the default allow-lists for the lifetime of the DOMPurify instance, so all subsequent default-config sanitize calls inherit the widened defaults and attacker payloads using the poisoned tag/attribute name survive sanitization. removeAllHooks(), clearConfig(), and passing a fresh cfg do not recover the state; only constructing a new DOMPurify instance does.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 13:58 UTC
CWE
  • CWE-501 - Trust Boundary Violation
Assigner
References
Impacted products
Vendor Product Version CPE status
cure53 DOMPurify Affected: 0 , < 3.4.7 (semver)
Unaffected: 3.4.7 (semver)
    cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-26 00:00
Credits
offset
Show details on NVD website
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