Is CVE-2026-89040 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-89040?

CVE-2026-89040 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-89040

Description

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.