{"id":"CVE-2026-75110","state":"PUBLISHED","title":"MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET","description":"MemOS is a memory operating system for LLMs and AI agents. In deployments where authentication is enabled (AUTH_ENABLED=true) but the undocumented, defaultless INTERNAL_SERVICE_SECRET environment variable is unset, the is_internal_request() check in src/memos/api/middleware/auth.py fails open: os.getenv(\"INTERNAL_SERVICE_SECRET\") returns None and a request omitting the X-Internal-Service header also yields None, so the comparison None == None evaluates true. The request is then treated as a trusted internal principal and granted scopes: [\"all\"]. As a result, an unauthenticated remote attacker can reach the admin API-key management endpoints to mint API keys for any user, enumerate keys, revoke keys, and generate a master key for persistent privileged access, as well as all data endpoints.","publishedAt":"2026-08-17T20:36:04.095Z","updatedAt":"2026-09-24T14:19:23.001Z","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":"VulnCheck"},"assigner":"VulnCheck","products":["MemTensor MemOS"],"affected":[{"vendor":"MemTensor","product":"MemOS","packageURL":"pkg:pypi/MemoryOS","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.0.30","versionType":"custom"}],"repo":"https://github.com/MemTensor/MemOS"}],"references":["https://github.com/MemTensor/MemOS/issues/2259","https://github.com/MemTensor/MemOS","https://github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py","https://www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-internal-service-secret"],"weaknesses":["CWE-697"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/75xxx/CVE-2026-75110.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75110","state":"PUBLISHED","datePublished":"2026-08-17T20:36:04.095Z","dateUpdated":"2026-09-24T14:19:23.001Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-17T17:28:41.677Z"},"containers":{"cna":{"title":"MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET","descriptions":[{"lang":"en","value":"MemOS is a memory operating system for LLMs and AI agents. In deployments where authentication is enabled (AUTH_ENABLED=true) but the undocumented, defaultless INTERNAL_SERVICE_SECRET environment variable is unset, the is_internal_request() check in src/memos/api/middleware/auth.py fails open: os.getenv(\"INTERNAL_SERVICE_SECRET\") returns None and a request omitting the X-Internal-Service header also yields None, so the comparison None == None evaluates true. The request is then treated as a trusted internal principal and granted scopes: [\"all\"]. As a result, an unauthenticated remote attacker can reach the admin API-key management endpoints to mint API keys for any user, enumerate keys, revoke keys, and generate a master key for persistent privileged access, as well as all data endpoints."}],"affected":[{"vendor":"MemTensor","product":"MemOS","packageURL":"pkg:pypi/MemoryOS","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.0.30","versionType":"custom"}],"repo":"https://github.com/MemTensor/MemOS"}],"references":[{"url":"https://github.com/MemTensor/MemOS/issues/2259","tags":["issue-tracking"],"name":"GitHub Issue #2259"},{"url":"https://github.com/MemTensor/MemOS","tags":["product"]},{"url":"https://github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py","tags":["technical-description"],"name":"is_internal_request in src/memos/api/middleware/auth.py"},{"url":"https://www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-internal-service-secret","name":"VulnCheck Advisory: MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-697","lang":"en","description":"Incorrect Comparison","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-24T14:19:23.001Z"},"datePublic":"2026-08-16T00:00:00.000Z","credits":[{"lang":"en","value":"George Chen","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/MemTensor/MemOS/issues/2259","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T12:48:39.747053Z","id":"CVE-2026-75110","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-18T12:51:49.539Z"}}]}}}