CVE-2026-42880

ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

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

argoproj · argo-cd

CVSS v3.1 CNA

7.7 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 GITHUB

9.6 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS

0.56% chance of exploitation in the next 30 days, 46th percentile

Published

2026-05-07

Updated

2026-09-07

Proof-of-concept exploits (2)

• advisories/GHSA-3v3m-wc6v-x4x3
• HAERIN-L/POC_CVE-2026-428800★ · 2026-06-01

Security advisories

• argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3

References

• CVE Record
• NVD entry

Related

• CVE-2026-42208
• CVE-2026-46716