CVE-2026-77459

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{"affected": [{"affectedData": [{"product": "argo-cd", "vendor": "argoproj", "versions": [{"status": "affected", "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"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-77459", "lastModified": "2026-10-16T16:00:33.533", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77459", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-14T15:27:27.557503Z", "version": "2.0.3"}}]}, "published": "2026-10-13T17:17:46.050", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/releases/tag/v3.3.15"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/releases/tag/v3.4.10"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/releases/tag/v3.5.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2"}, {"source": "security-advisories@github.com", "url": "https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "argo-cd: github.com/argoproj/argo-cd/v3: github.com/argoproj/argo-cd/v2: argo-cd: AppProject restrictions bypassed by PreDelete/PostDelete resource hooks", "id": "2548643", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2548643"}, "csaw": false, "cwe": "CWE-653", "details": ["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.", "A flaw was found in argo-cd. PreDelete and PostDelete resource hooks bypass AppProject security policies that restrict destination servers, namespaces, and permitted resource types. An authenticated attacker with write access to a linked Git repository can commit malicious delete hooks, which Argo CD executes using the controller's elevated cluster credentials upon application deletion. This flaw allows an attacker to achieve privilege escalation by creating unauthorized resources across restricted namespaces or the entire cluster."], "name": "CVE-2026-77459", "package_state": [{"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Not affected", "package_name": "odf4/odf-multicluster-rhel9-operator", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/argocd-agent-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/argocd-image-updater-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/gitops-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/gitops-rhel9-operator", "product_name": "Red Hat OpenShift GitOps"}], "public_date": "2026-10-07T16:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77459\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77459\nhttps://github.com/argoproj/argo-cd/commit/d5dd7019e\nhttps://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp"], "threat_severity": "Important"}

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