---
cve: "CVE-2026-89040"
severity: "CRITICAL"
cvss: 9.3
epss: "0.9%"
vendor: "Tencent"
kev: false
exploited: false
published: "2026-09-15 20:19:20"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T23:19:40+02:00"
---

# CVE-2026-89040

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

Tencent Mass Service Engine in Cluster (MSEC) allows a remote, unauthenticated attacker to send a crafted POST request including ../ and gain root access on the target device. An attacker who uploads a webshell can execute arbitrary code as root.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/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://github.com/Tencent/MSEC>
- <https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json>
- <https://www.cve.org/CVERecord?id=CVE-2026-89040>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89040) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_