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.

Scores

EPSS (exploitation in 30 days)

0.50% · top 57% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.

Weakness

• CWE-863: Incorrect Authorization (opens in a new tab)All about CWE-863 and its CVEs

Affected products

• argoproj · argo-cd

  • affected >= 2.10.0, <= 2.14.21
  • affected >= 3.0.0, < 3.3.15
  • affected >= 3.4.0, < 3.4.10
  • affected >= 3.5.0, < 3.5.4
  • affected >= 3.6.0-rc1, < 3.6.0-rc2

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Gogithub.com/argoproj/argo-cd/v2GHSA-fmxq-cgp8-87wp (opens in a new tab)
• Gogithub.com/argoproj/argo-cd/v3GHSA-fmxq-cgp8-87wp (opens in a new tab)

References (9)

• https://github.com/argoproj/argo-cd/security/advisories/GHSA-fmxq-cgp8-87wp (opens in a new tab)x_refsource_CONFIRM
• https://github.com/argoproj/argo-cd/commit/1149cdc6e932208c4402183cc3d7b7485239940c (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/commit/4bc8085b0a6d2296b849539d3d09fc7be7a4a511 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/commit/7f0a05834b05103d69d7c150e1ee36541b314696 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/commit/d5dd7019ee65be8895133fe4df554e28074242c4 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/releases/tag/v3.3.15 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/releases/tag/v3.4.10 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/releases/tag/v3.5.4 (opens in a new tab)x_refsource_MISC
• https://github.com/argoproj/argo-cd/releases/tag/v3.6.0-rc2 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-fmxq-cgp8-87wp (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-77459](https://trackcve.app/badge/CVE-2026-77459.svg)](https://trackcve.app/cve/CVE-2026-77459)

Record last updated 14 Oct 2026, 15:29 UTC.