Security Advisory

CVE-2026-55850

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-21 18:30:12

Last updated 2026-08-21 19:54:55

Assigner GitHub_M

CVSS score 5.3

State PUBLISHED

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.

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