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Medium severity6.1NVD Advisory· Published Jul 23, 2026· Updated Jul 28, 2026

CVE-2026-65902

CVE-2026-65902

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
dompurifynpm
< 3.4.73.4.7

Affected products

31

Patches

Vulnerability mechanics

References

4

News mentions

0

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