Vulnerabilities CVE-2026-55850

CVE-2026-55850

Medium

Open

TLP:CLEAR

Element Web: A malicious homeserver can inject HTML in Element Web using its homepage

NVD CVE.org

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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.

Details

CVSS Score: 5.3
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 21, 2026
Last Modified: Aug 21, 2026

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