Remote Code Execution Vulnerability in Tencent Mass Service Engine
CVE-2026-89040

9.3CRITICAL

Key Information:

Vendor

Tencent

Status
Mass Service Engine In Cluster (msec)
Vendor
CVE Published:
15 September 2026

What is CVE-2026-89040?

A vulnerability in Tencent's Mass Service Engine (MSEC) allows an unauthenticated attacker to exploit the system by sending a specially crafted POST request. This can lead to unauthorized root access on the affected device. If an attacker successfully uploads a webshell, they can execute arbitrary code with root privileges, posing a significant risk to the integrity and security of the system.

Affected Version(s)

Mass Service Engine in Cluster (MSEC) 0

References

https://github.com/Tencent/MSEC
product
https://raw.githubusercontent.com/cisagov/CSAF/develop/cs...
third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2026-89040
vdb-entry

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Renatto Cecot Sommerer
.