Auth bypass in Argoproj Argo-Workflows
CVE-2026-93991
Argo Workflows versions 4.1.0 through 4.1.3 contain an authorization bypass vulnerability in ListArchivedWorkflows that fails to apply cluster-scoped access review when the metadata.namespace field selector uses the NotEquals operator. Attackers with namespace-scoped list permissions can use a negated namespace field selector to retrieve archived workflows from all other namespaces, exposing spec arguments, parameter values, and annotations.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4 (vendor-advisory)
- github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca5… (patch)
- github.com/argoproj/argo-workflows/releases/tag/v4.1.4 (release-notes)
- github.com/argoproj/argo-workflows (product)
- www.vulncheck.com/advisories/argo-workflows-4.1.0-through-4.1.3-cross-namespace… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93991?
- CVE-2026-93991 is a high-severity vulnerability in Argoproj Argo-Workflows, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-09-19.
- How severe is CVE-2026-93991?
- High severity. CVSS v3 base score is 7.7 out of 10.