CVE-2026-55850: medium-severity vulnerability in element-hq element-web
Element Web: A malicious homeserver can inject HTML in Element Web using its homepage
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
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.
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
Affected products
element-hq · element-webRelated CVEs — element-hq element-web
In the same product, most dangerous first.
CVE-2024-51750MEDIUMElement allows a malicious homeserver can modify events leading to unrenderable events or roomsEPSS 0.5%CVE-2024-47779HIGHElement Web vulnerable to potential exposure of access token via authenticated mediaEPSS 0.4%CVE-2025-59161LOWIn Element Web and Element Desktop, a malicious room can hide an unrelated room and cause it to be left when the malicious room is leftEPSS 0.4%CVE-2024-51749LOWElement's thumbnails can be abused to misrepresent the content of an attachmentEPSS 0.4%CVE-2025-32026LOWElement Web could load a malicious instance of Element Call leaking media encryption keysEPSS 0.2%CVE-2026-119407HIGHElement Web and Element Desktop before 1.12.32 Forced Logout via Guest Credential URL ParametersEPSS 0.1%