CVE-2026-89040
CVSS v3
9.8
CRITICAL
EPSS Score
1.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2026-09-15
- Last Modified
- 2026-09-15
Frequently asked questions
What is CVE-2026-89040?
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.
Is CVE-2026-89040 actively exploited?
Active exploitation of CVE-2026-89040 has not been confirmed. Its EPSS score was 1.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-89040?
CVE-2026-89040 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2026-89040 affecting your environment?
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