CVE-2026-89040
Tencent Mass Service Engine in Cluster (MSEC) path traversal
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.
INFO
Published Date :
Sept. 15, 2026, 8:19 p.m.
Last Modified :
Sept. 15, 2026, 8:19 p.m.
Remotely Exploit :
Yes !
Source :
9119a7d8-5eab-497f-8521-727c672e3725
Affected Products
The following products are affected by CVE-2026-89040
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 9119a7d8-5eab-497f-8521-727c672e3725 | |||||
| CVSS 3.1 | CRITICAL | 9119a7d8-5eab-497f-8521-727c672e3725 | ||||
| CVSS 4.0 | CRITICAL | 9119a7d8-5eab-497f-8521-727c672e3725 |
Solution
- Restrict access to the MSEC service.
- Apply vendor patches when available.
- Remove any uploaded webshells.
- Review system logs for unauthorized access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-89040.
| URL | Resource |
|---|---|
| https://github.com/Tencent/MSEC | |
| https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json | |
| https://www.cve.org/CVERecord?id=CVE-2026-89040 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89040 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89040
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-89040 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-89040 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 9119a7d8-5eab-497f-8521-727c672e3725
Sep. 15, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-89040', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-25T15:35:51.155854Z'} Added Tag unsupported-when-assigned 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-22 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89040.json">CVE-2026-89040</a> Added Reference https://github.com/Tencent/MSEC Added Reference https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json Added Reference https://www.cve.org/CVERecord?id=CVE-2026-89040