Auth bypass in Argoproj Argo-Cd

CVE-2026-77459

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.

Vulnerability class: Broken Access Control

Published .

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

  • Argoproj Argo-Cd — versions >= 2.10.0, <= 2.14.21, >= 3.0.0, < 3.3.15, >= 3.4.0, < 3.4.10

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77459?
CVE-2026-77459 is a critical-severity vulnerability in Argoproj Argo-Cd, classified under Incorrect Authorization. CVSS score: 9.9/10. Published 2026-10-13.
How severe is CVE-2026-77459?
Critical severity. CVSS v3 base score is 9.9 out of 10.