Element Web is a Matrix web client built using the Matrix React SDK.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Aug 21, 2026 · NIST NVD

   Detected

   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 prev

2. Oct 14, 2026 · NIST NVD

   Updated

   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 prev

Sources

• CVE.orgVulnerability recordCVE-2026-55850

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-55850

  30-day exploitation probability 0.5%

  first.org
• NIST NVDVulnerability recordCVE-2026-55850

  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

  nvd.nist.gov

References

• Reference · github.com
• Reference · github.com
• Reference · github.com
• Reference · machinespirits.com