CVE-2026-65914 DOMPurify before 3.3.2 Mutation XSS via Re-Contextualization
Attackers can execute JavaScript via mutation XSS when sanitized HTML is reinserted into specific parsing contexts using innerHTML.
- 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-2026-65914?
CVE-2026-65914 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 before 3.3.2 contains a mutation-XSS vulnerability when sanitized HTML is reinserted into special parsing contexts using innerHTML with wrappers like script, xmp, iframe, noembed, noframes, or noscript. Attackers can craft payloads with closing sequences that break out of the wrapper context during reparsing, reactivating dangerous markup with event handlers to execute JavaScript.
Weakness: CWE-79
Which versions are affected by CVE-2026-65914?
2 open source packages ship an affected version, including dompurify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
dompurify npm | All versions | 3.3.2 |
dompurify npm | All versions | 3.3.2 |
Products include Cure53 Dompurify.
How do I fix CVE-2026-65914?
Upgrade dompurify to 3.3.2 or later.
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-2026-65914 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65914 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 CLEANSTART-2026-JZ72175, CLSA-2026-1784164097, DEBIAN-CVE-2026-65914, ECHO-bb40-b77b-303b, GHSA-h8r8-wccr-v5f2, MINI-4rf6-32cm-mf22 and 11 more.