Medium severity · published Oct 26, 2026
CVE-2026-116803
DOMPurify before 3.4.17 DOM XSS via IN_PLACE Hook-Detached Subtrees
New
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DO
DOMPurify · cure53
before 3.4.17 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116803
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116803
github.com
https://github.com/cure53/DOMPurify/security/advisories/GHSA-mrv2-3pqr-j5jr
www.vulncheck.com
https://www.vulncheck.com/advisories/dompurify-before-3.4.17-dom-xss-via-in-place-hook-detached-subtrees
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