CVE-2026-65902
DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 23, 2026
- Updated
- Oct 29, 2026
- Reserved
- Jul 23, 2026
Description
DOMPurify before 3.4.7 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-501 Trust Boundary Violation
Affected Products
| Product | Versions |
|---|---|
DOMPurifycure53 |
|
References
- GitHub Security Advisory (GHSA-76mc-f452-cxcm)vendor-advisory
- Patch Commitpatch
- VulnCheck Advisory: DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTagsthird-party-advisory
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