CVE-2026-55850Element Web: A malicious homeserver can inject HTML in Element Web using its homepage
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.3 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
element-hq element-web element_hq:element_web (from the name) | before 1.12.22 | CNA record |
References
- https://github.com/element-hq/element-web/security/advisories/GHSA-wrcp-5v3v-3j6vx-refsource-confirm
- https://github.com/element-hq/element-web/commit/7949980a7e3c7e397d7afe899ef1b0563c417b0ex-refsource-misc
- https://github.com/element-hq/element-web/releases/tag/v1.12.22x-refsource-misc
- https://www.machinespirits.com/advisory/563a17x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.