Vulnerability Description
Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content through dangerouslySetInnerHTML without passing it through sanitizedHtmlNode. A malicious homeserver can provide crafted HTML that Element Web renders on the homepage; the content security policy prevents JavaScript but not phishing HTML. This issue is fixed in version 1.12.22.
Related Weaknesses (CWE)
References
- https://github.com/element-hq/element-web/commit/7949980a7e3c7e397d7afe899ef1b05
- https://github.com/element-hq/element-web/releases/tag/v1.12.22
- https://github.com/element-hq/element-web/security/advisories/GHSA-wrcp-5v3v-3j6
- https://www.machinespirits.com/advisory/563a17
FAQ
What is CVE-2026-55850?
CVE-2026-55850 is a documented vulnerability. Element Web is a Matrix web client built using the Matrix React SDK. Prior to 1.12.22, EmbeddedPage in apps/web/src/components/structures/EmbeddedPage.tsx renders homeserver-supplied homepage content ...
How severe is CVE-2026-55850?
CVSS scoring is not yet available for CVE-2026-55850. Check NVD for updates.
Is there a patch for CVE-2026-55850?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.