{"id":"CVE-2026-77459","state":"PUBLISHED","title":"Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks","description":"Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From 2.10.0 until 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2, Argo CD creates PostDelete resource hooks without applying the AppProject destination and resource authorization checks used during ordinary synchronization. The omitted checks include cluster-scoped and namespaced resource allow/deny lists. A user who can write to an Application's Git repository can commit a delete hook targeting a forbidden namespace, server, group, kind, or resource name, and deletion of the Application causes the application-controller to create that resource with its destination-cluster credentials. The reachable impact is bounded by the controller's cluster access but can include cluster-scoped resources, disallowed namespaces, persistent hook objects, and secondary objects created by a hook Job. PreSync, Sync, PostSync, and SyncFail hooks continue to use the normal project checks. This issue is fixed in versions 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2.","publishedAt":"2026-10-13T16:26:47.088Z","updatedAt":"2026-10-14T15:29:55.346Z","severity":{"score":9.9,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["argoproj argo-cd"],"affected":[{"vendor":"argoproj","product":"argo-cd","versions":[{"version":">= 2.10.0, <= 2.14.21","status":"affected"},{"version":">= 3.0.0, < 3.3.15","status":"affected"},{"version":">= 3.4.0, < 3.4.10","status":"affected"},{"version":">= 3.5.0, < 3.5.4","status":"affected"},{"version":">= 3.6.0-rc1, < 3.6.0-rc2","status":"affected"}]}],"references":["https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp","https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c","https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511","https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696","https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4","https://github.com/argoproj/argo-cd/releases/tag/v3.3.15","https://github.com/argoproj/argo-cd/releases/tag/v3.4.10","https://github.com/argoproj/argo-cd/releases/tag/v3.5.4","https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77459.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77459","state":"PUBLISHED","datePublished":"2026-10-13T16:26:47.088Z","dateUpdated":"2026-10-14T15:29:55.346Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T20:07:49.961Z"},"containers":{"cna":{"title":"Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks","descriptions":[{"lang":"en","value":"Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From 2.10.0 until 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2, Argo CD creates PostDelete resource hooks without applying the AppProject destination and resource authorization checks used during ordinary synchronization. The omitted checks include cluster-scoped and namespaced resource allow/deny lists. A user who can write to an Application's Git repository can commit a delete hook targeting a forbidden namespace, server, group, kind, or resource name, and deletion of the Application causes the application-controller to create that resource with its destination-cluster credentials. The reachable impact is bounded by the controller's cluster access but can include cluster-scoped resources, disallowed namespaces, persistent hook objects, and secondary objects created by a hook Job. PreSync, Sync, PostSync, and SyncFail hooks continue to use the normal project checks. This issue is fixed in versions 3.3.15, 3.4.10, 3.5.4, and 3.6.0-rc2."}],"affected":[{"vendor":"argoproj","product":"argo-cd","versions":[{"version":">= 2.10.0, <= 2.14.21","status":"affected"},{"version":">= 3.0.0, < 3.3.15","status":"affected"},{"version":">= 3.4.0, < 3.4.10","status":"affected"},{"version":">= 3.5.0, < 3.5.4","status":"affected"},{"version":">= 3.6.0-rc1, < 3.6.0-rc2","status":"affected"}]}],"references":[{"url":"https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp","name":"https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c","name":"https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511","name":"https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696","name":"https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4","name":"https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/releases/tag/v3.3.15","name":"https://github.com/argoproj/argo-cd/releases/tag/v3.3.15","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/releases/tag/v3.4.10","name":"https://github.com/argoproj/argo-cd/releases/tag/v3.4.10","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/releases/tag/v3.5.4","name":"https://github.com/argoproj/argo-cd/releases/tag/v3.5.4","tags":["x_refsource_MISC"]},{"url":"https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2","name":"https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-13T16:26:47.088Z"},"source":{"advisory":"GHSA-fmxq-cgp8-87wp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-14T15:27:27.557503Z","id":"CVE-2026-77459","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":"2026-10-14T15:29:55.346Z"}}]}}}