CVE-2026-89040

CRITICAL 9.8

Tencent Mass Service Engine in Cluster (MSEC) path traversal

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	tencent
Product	mass service engine in cluster (msec)
Published	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Tencent / Mass Service Engine in Cluster (MSEC)

0 < *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Tencent/MSEC raw.githubusercontent.com: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json cve.org: https://www.cve.org/CVERecord?id=CVE-2026-89040

Credits

Renatto Cecot Sommerer