CVE-2026-55850: Element-Hq Element-Web

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Element-Hq Element-Web: before 1.12.22 (fixed in 1.12.22)

Published 2026-08-21. Last modified 2026-09-30.