CVE-2026-116803

MEDIUM 6.1

DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtrees

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to keep event handlers armed when an IN_PLACE hook removes a parent or sibling node. Attacker markup in detached subtrees is never walked or neutralized, so handlers like img onerror fire after sanitize() returns, causing DOM XSS.

CWE	CWE-79
Vendor	cure53
Product	dompurify
Published	Oct 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

cure53 / DOMPurify

0 < 3.4.17

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cure53/DOMPurify/security/advisories/GHSA-mrv2-3pqr-j5jr vulncheck.com: https://www.vulncheck.com/advisories/dompurify-before-3.4.17-dom-xss-via-in-place-hook-detached-subtrees

Credits

🔍 uttej-badwane