CVE-2026-42880
High
High exploit probability or critical severity with a known exploit.
CVSS base
9.6
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
EPSS — probability of exploitation (30 days)
0.5%
42.2th percentile
CISA KEV
Not listed
Weakness / dates
CWE-201
Published 2026-05-07 · modified 2026-09-07
Description
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
References
- exploit https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
- https://access.redhat.com/errata/RHBA-2026:12433
- https://access.redhat.com/errata/RHSA-2026:20943
- https://access.redhat.com/errata/RHSA-2026:20947
- https://access.redhat.com/security/cve/CVE-2026-42880
- https://bugzilla.redhat.com/show_bug.cgi?id=2467882
- exploit https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42880.json