{"id":"CVE-2026-71308","state":"PUBLISHED","title":"Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates","description":"Lemur manages TLS certificate creation. From 0.5.0 until 1.9.3, certificate create, upload, and edit requests accepted replaces[] or replacements identifiers that AssociatedCertificateSchema resolved with fetch_objects without a CertificatePermission check. Assigning those objects to Certificate.replaces invoked an append listener that disabled the victim certificate notifications and marked it as replaced. The victim was then excluded from get_all_pending_reissue, and certificate_rotate could deploy the attacker certificate to endpoints serving the victim. An authenticated non-read-only user could target certificates for which the user had no ownership or role, suppress lifecycle automation, and cause fleet-wide TLS disruption or unauthorized substitution. The fix authorizes every referenced replacement certificate before mutation. This issue is fixed in version 1.9.3.","publishedAt":"2026-08-18T19:00:40.503Z","updatedAt":"2026-08-18T19:34:59.015Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["Netflix lemur"],"affected":[{"vendor":"Netflix","product":"lemur","versions":[{"version":">= 0.5.0, < 1.9.3","status":"affected"}]}],"references":["https://github.com/Netflix/lemur/security/advisories/GHSA-cfh6-pv5c-38jv","https://github.com/Netflix/lemur/commit/286874535160952143b0afe2d356642669f9d4c6","https://github.com/Netflix/lemur/releases/tag/v1.9.3"],"weaknesses":["CWE-639","CWE-862"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71308.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71308","state":"PUBLISHED","datePublished":"2026-08-18T19:00:40.503Z","dateUpdated":"2026-08-18T19:34:59.015Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-05T18:14:42.063Z"},"containers":{"cna":{"title":"Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates","descriptions":[{"lang":"en","value":"Lemur manages TLS certificate creation. From 0.5.0 until 1.9.3, certificate create, upload, and edit requests accepted replaces[] or replacements identifiers that AssociatedCertificateSchema resolved with fetch_objects without a CertificatePermission check. Assigning those objects to Certificate.replaces invoked an append listener that disabled the victim certificate notifications and marked it as replaced. The victim was then excluded from get_all_pending_reissue, and certificate_rotate could deploy the attacker certificate to endpoints serving the victim. An authenticated non-read-only user could target certificates for which the user had no ownership or role, suppress lifecycle automation, and cause fleet-wide TLS disruption or unauthorized substitution. The fix authorizes every referenced replacement certificate before mutation. This issue is fixed in version 1.9.3."}],"affected":[{"vendor":"Netflix","product":"lemur","versions":[{"version":">= 0.5.0, < 1.9.3","status":"affected"}]}],"references":[{"url":"https://github.com/Netflix/lemur/security/advisories/GHSA-cfh6-pv5c-38jv","name":"https://github.com/Netflix/lemur/security/advisories/GHSA-cfh6-pv5c-38jv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Netflix/lemur/commit/286874535160952143b0afe2d356642669f9d4c6","name":"https://github.com/Netflix/lemur/commit/286874535160952143b0afe2d356642669f9d4c6","tags":["x_refsource_MISC"]},{"url":"https://github.com/Netflix/lemur/releases/tag/v1.9.3","name":"https://github.com/Netflix/lemur/releases/tag/v1.9.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-18T19:00:40.503Z"},"source":{"advisory":"GHSA-cfh6-pv5c-38jv","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Netflix/lemur/security/advisories/GHSA-cfh6-pv5c-38jv","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T19:34:39.582542Z","id":"CVE-2026-71308","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-18T19:34:59.015Z"}}]}}}