CVE-2026-55850
Element Web: A malicious homeserver can inject HTML in Element Web using its homepage
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | element-hq |
| Product | element-web |
| Published | Aug 21, 2026 |
| Last Updated | Aug 21, 2026 |
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Affected Versions
element-hq / element-web
< 1.12.22
References
github.com: https://github.com/element-hq/element-web/security/advisories/GHSA-wrcp-5v3v-3j6v github.com: https://github.com/element-hq/element-web/commit/7949980a7e3c7e397d7afe899ef1b0563c417b0e github.com: https://github.com/element-hq/element-web/releases/tag/v1.12.22 machinespirits.com: https://www.machinespirits.com/advisory/563a17