VULNERABILITY INTELLIGENCE
CVE-2026-55850
EPSS probability0.55%
CISA KEVNot currently listed
Published2026-08-21
Last modified2026-10-14
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.
Weakness classification
- security-advisories@github.com: CWE-79