{"id":"CVE-2026-89040","state":"PUBLISHED","title":"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.","publishedAt":"2026-09-15T20:05:07.497Z","updatedAt":"2026-09-22T16:22:37.341Z","severity":{"score":9.3,"label":"Critical","version":"4.0","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","source":"cisa-cg"},"assigner":"cisa-cg","products":["Tencent Mass Service Engine in Cluster (MSEC)"],"affected":[{"vendor":"Tencent","product":"Mass Service Engine in Cluster (MSEC)","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":["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"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89040.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89040","state":"PUBLISHED","datePublished":"2026-09-15T20:05:07.497Z","dateUpdated":"2026-09-22T16:22:37.341Z","assignerShortName":"cisa-cg","assignerOrgId":"9119a7d8-5eab-497f-8521-727c672e3725","dateReserved":"2026-09-10T16:43:38.518Z"},"containers":{"cna":{"title":"Tencent Mass Service Engine in Cluster (MSEC) path traversal","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Tencent","product":"Mass Service Engine in Cluster (MSEC)","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://github.com/Tencent/MSEC","name":"url","tags":["product"]},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-258-02.json","name":"url","tags":["third-party-advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89040","name":"url","tags":["vdb-entry"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"cvssV4_0":{"version":"4.0","baseScore":9.3,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"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","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","subIntegrityImpact":"NONE","vulnIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T15:35:51.155854Z","id":"CVE-2026-89040","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"cisa-cg","orgId":"9119a7d8-5eab-497f-8521-727c672e3725","dateUpdated":"2026-09-15T20:05:07.497Z"},"tags":["unsupported-when-assigned"],"credits":[{"value":"Renatto Cecot Sommerer","lang":"en"}],"datePublic":"2026-09-15T00:00:00.000Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T16:22:29.446485Z","id":"CVE-2026-89040","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-22T16:22:37.341Z"}}]}}}