CVE-2026-42880: Argoproj Argo Cd

Critical severity, CVSS 9.6. EPSS: 0.6% chance of exploitation in the next 30 days.

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.

Affected products

• Argoproj Argo Cd: from 3.2.0, before 3.2.11 (fixed in 3.2.11); from 3.3.0, before 3.3.9 (fixed in 3.3.9)

Published 2026-05-07. Last modified 2026-09-07.