CVE-2026-89040
CriticalCVSS 9.8Summary
Tencent Mass Service Engine in Cluster (MSEC) allows a remote, unauthenticated attacker to send a crafted POST request containing ../ and gain root access on the target device. An attacker who uploads a webshell can execute arbitrary code as root.
Risk Assessment
The vulnerability allows an unauthenticated attacker to fully take over the device with root privileges, posing a critical threat to confidentiality, integrity, and availability. Exposing the service to the network significantly increases the risk.
Recommendation
Apply vendor-provided patches as soon as possible or upgrade MSEC to a non-vulnerable version. Restrict network access to the service and check the system for webshells.
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Original NVD description (English source)
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.