CVE-2026-89040

Tencent Mass Service Engine in Cluster (MSEC) path traversal

Published Sep 15, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Tencent
Tencent mass Service Engine In Cluster (msec)
Vendors & Products Tencent
Tencent mass Service Engine In Cluster (msec)
Type Values Removed Values Added
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.
Title Tencent Mass Service Engine in Cluster (MSEC) path traversal
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisa-cg
Published
Updated
Sep 22, 2026, 4:22 PM
Reserved
Sep 10, 2026, 4:43 PM
Status
Awaiting Analysis
Published
Sep 15, 2026, 8:19 PM
Modified
Sep 22, 2026, 5:17 PM