CVE-2026-109344

6.1Medium

Published 12 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

6.1Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-79

Impact

Attackers can execute arbitrary JavaScript in the victim's browser context if the user views malicious markup. This requires a victim to load attacker-supplied content in an application using custom DOMPurify sanitize hooks.

Root cause

DOMPurify's IN_PLACE mode fails to sanitize detached DOM subtrees when afterSanitizeElements or afterSanitizeAttributes hooks remove wrapper elements, leaving armed event handlers intact.

Affected systems

DOMPurify from 3.4.13 before 3.4.16

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Fix & remediation

Upgrade DOMPurify to version 3.4.16 or higher. If upgrading must wait, avoid using IN_PLACE mode alongside afterSanitizeElements or afterSanitizeAttributes hooks that detach wrapper nodes.

shell

$ npm install dompurify@^3.4.16

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

DOMPurify from 3.4.13 before 3.4.16 contains a cross-site scripting vulnerability because IN_PLACE mode fails to neutralize subtrees detached by afterSanitizeElements or afterSanitizeAttributes hooks. Attackers can supply markup with on* handlers inside a wrapper removed by such hooks, leaving handlers armed on the live DOM to execute script in the victim origin.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109344