---
cve: "CVE-2026-40139"
severity: "CRITICAL"
cvss: 9.2
epss: "67%"
vendor: "BeyondTrust"
kev: false
exploited: false
published: "2026-07-06 17:16:30"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T10:57:26+02:00"
---

# CVE-2026-40139

> 9.2 CRITICAL

## Beschreibung

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain unauthorized access to the appliance, including accounts with elevated privileges. Exploitation requires a specific authentication configuration to be enabled.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

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

## Referenzen

- <https://www.beyondtrust.com/trust-center/security-advisories/bt26-03>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-40139) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_