{"id":"CVE-2026-89040","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-89040","generatedAt":"2026-09-20T10:52:21.735Z","title":"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.","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.","published":"2026-09-15T20:19:20.000Z","lastModified":"2026-09-18T19:34:37.000Z","status":"Awaiting Analysis","sourceIdentifier":"9119a7d8-5eab-497f-8521-727c672e3725","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-22"],"affected":[],"epss":{"score":0.0093,"percentile":0.59066,"date":"2026-09-19","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.93%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/Tencent/MSEC","source":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json","source":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89040","source":"9119a7d8-5eab-497f-8521-727c672e3725"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89040","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}