---
cve: "CVE-2026-55850"
severity: "MEDIUM"
cvss: 5.3
epss: "0.3%"
vendor: "element-hq"
kev: false
exploited: false
published: "2026-08-21 19:17:04"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T00:02:23+02:00"
---

# CVE-2026-55850

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 7949980a7e3c7e397d7afe899ef1b0563c417b0e (Commit)
- 94636e8d4d9e7fe96d2d598456551f4847f3bbba (Commit)

## Referenzen

- <https://github.com/element-hq/element-web/security/advisories/GHSA-wrcp-5v3v-3j6v>
- <https://github.com/element-hq/element-web/commit/7949980a7e3c7e397d7afe899ef1b0563c417b0e>
- <https://github.com/element-hq/element-web/releases/tag/v1.12.22>
- <https://www.machinespirits.com/advisory/563a17>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55850) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_