CVE-2026-65901 DOMPurify 3.4.6 Cross-Site Scripting via IN_PLACE nodeName
Attackers can execute arbitrary scripts by exploiting DOMPurify's IN_PLACE mode to bypass sanitization via manipulated node names.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-65901?
CVE-2026-65901 is a medium-severity cross-site scripting vulnerability in cure53 DOMPurify, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
DOMPurify through 3.4.6 contains a cross-site scripting vulnerability in IN_PLACE mode that trusts attacker-controlled nodeName on live non-form nodes. Attackers can supply hostile live DOM objects with real script children whose observable nodeName is clobbered to appear as allowed elements, causing scripts to execute when the sanitized tree is inserted into a live document.
Weakness: CWE-79
Which versions are affected by CVE-2026-65901?
2 open source packages ship an affected version, including dompurify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
dompurify npm | All versions to 3.4.6 | None |
dompurify npm | All versions to 3.4.6 | None |
Products include Cure53 Dompurify.
How do I fix CVE-2026-65901?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-65901 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65901 exists.
Other vulnerabilities in cure53 DOMPurify
- CVE-2024-47875 DOMPurify nesting-based mXSS
- CVE-2024-48910 DOMPurify vulnerable to tampering by prototype polution
- CVE-2026-47423 DOMPurify XSS via `selectedcontent` re-clone
- CVE-2024-45801 Tampering by prototype polution in DOMPurify
- CVE-2026-49978 DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content
Sources
Also known as CLSA-2026-1784596351, CLSA-2026-1784682973, CLSA-2026-1784683092, CLSA-2026-1784769526, CLSA-2026-1784856036, DEBIAN-CVE-2026-65901 and 20 more.