---
cve: "CVE-2026-58066"
severity: "CRITICAL"
cvss: 9.8
epss: "24%"
vendor: "Rocket.Chat"
kev: false
exploited: false
published: "2026-07-30 06:25:55"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T15:24:12+02:00"
---

# CVE-2026-58066

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

Rocket.Chat's SAML SSO before versions 8.7.0, 8.6.1, 8.5.2, 8.4.5, 8.3.7, 8.2.7, 8.1.7, 8.0.8, and 7.10.14 verified XML signatures but did not bind the validated signature to samlp:Response / saml:Assertion. An attacker could submit a wrapped document carrying forged identity attributes alongside any valid signature made by the trusted IdP certificate, and log in as an arbitrary user.

## CVSS-Vektor

```
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 8300b3eb262f498021ed9df0ae453e83ec3b9bdb (Commit)
- dbd9bf8a914ed3480c8d86dd40068d685388d9b7 (Commit)

## Referenzen

- <https://hackerone.com/reports/3827674>
- <https://github.com/RocketChat/Rocket.Chat/pull/41233>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-58066) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_