{"id":"CVE-2026-89040","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","summary":"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…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-22"],"vendor":"Tencent","product":"Mass Service Engine in Cluster (MSEC)","affected":["mass_service_engine_in_cluster_msec < *"],"published":"2026-09-15","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:34:36.657","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89040","references":[{"url":"https://github.com/Tencent/MSEC","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89040","label":"9119a7d8-5eab-497f-8521-727c672e3725"}],"tags":["nvd","cve.org"],"epss":0.0093,"epssPercentile":0.58539,"ingestedAt":"2026-09-15T20:44:02.608Z","slug":"CVE-2026-89040","body":"## Overview\n\nTencent 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}