Cross-Site Scripting Vulnerability in DOMPurify by Cure53
CVE-2026-109344

5.1MEDIUM

Key Information:

Vendor

Cure53

Status
Dompurify
Vendor
CVE Published:
12 October 2026

What is CVE-2026-109344?

DOMPurify versions 3.4.13 to 3.4.16 are susceptible to a cross-site scripting issue. This vulnerability arises when using the IN_PLACE mode, which fails to properly sanitize elements detached through the afterSanitizeElements or afterSanitizeAttributes hooks. Attackers can exploit this flaw by injecting malicious markup containing event handlers, thus enabling executable scripts within the live DOM, posing a risk to users interacting with affected web pages.

Affected Version(s)

DOMPurify 3.4.13 < 3.4.16

DOMPurify 3.4.16

References

https://github.com/cure53/DOMPurify/security/advisories/G...
vendor-advisory
https://www.vulncheck.com/advisories/dompurify-from-3.4.1...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

manus-pi
.