XSS in Cure53 Dompurify
CVE-2026-116803
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/cure53/DOMPurify/security/advisories/GHSA-mrv2-3pqr-j5jr (vendor-advisory)
- www.vulncheck.com/advisories/dompurify-before-3.4.17-dom-xss-via-in-place-hook-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116803?
- CVE-2026-116803 is a medium-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-27.
- How severe is CVE-2026-116803?
- Medium severity. CVSS v3 base score is 6.1 out of 10.