CVE-2026-55850 (GCVE-0-2026-55850)
Vulnerability from cvelistv5 – Published: 2026-08-21 18:30 – Updated: 2026-08-21 19:54
VLAI
EPSS
VEX
Title
Element Web: A malicious homeserver can inject HTML in Element Web using its homepage
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 19:54 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/element-hq/element-web/securit… | x_refsource_CONFIRM |
| https://github.com/element-hq/element-web/commit/… | x_refsource_MISC |
| https://github.com/element-hq/element-web/release… | x_refsource_MISC |
| https://www.machinespirits.com/advisory/563a17 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| element-hq | element-web |
Affected:
< 1.12.22
|
guessed |
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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