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CVE-2026-89040 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian GovernmentCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Tencent/MSEC	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
https://www.cve.org/CVERecord?id=CVE-2026-89040	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 22, 2026	CVE Modified	CISA-ADP
Sep 15, 2026	New CVE Received	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government