Vulnerability · Published Aug 18, 2026 · Assigned by VulnCheck

CVE-2026-75838DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE hook

Medium 5.1

In plain English

A medium-severity cross-site scripting in DOMPurify from cure53. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.4%top 66.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

DOMPurify before 3.4.13 contains a cross-site scripting vulnerability in IN_PLACE sanitization where element-removal hooks fail to neutralize detached subtrees. Attackers can supply HTML with event handlers on descendant elements that execute after sanitization completes, even though the returned root appears clean.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	node-dompurify	no fix listed	DEBIAN-CVE-2026-75838
Debian:13	node-dompurify	no fix listed	DEBIAN-CVE-2026-75838
Debian:14	node-dompurify	3.4.13+dfsg-1	DEBIAN-CVE-2026-75838
Ubuntu:22.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-75838
Ubuntu:24.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-75838
Ubuntu:26.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-75838
Ubuntu:26.10	node-dompurify	no fix listed	UBUNTU-CVE-2026-75838
npm	dompurify	3.4.13	GHSA-55q2-fjhq-7xh7

Affected products (as reported)

Vendor	Product	Versions
cure53	DOMPurify	0 – before 3.4.13

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

GitHub Security Advisory (GHSA-55q2-fjhq-7xh7) vendor-advisory
VulnCheck Advisory: DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE hook third-party-advisory