What’s Vulnerable › Vulnerabilities

CVE-2026-93991: Argo Workflows 4.1.0 through 4.1.3 Cross-Namespace Disclosure via Negated Selector

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-19 · updated 2026-09-22
• Weakness: CWE-639

Description

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.

Affected products

• argoproj argo-workflows: from 4.1.0 before 4.1.4 — fixed in 4.1.4

How to fix

Upgrade to a fixed version: argoproj argo-workflows 4.1.4. Check the vendor advisory for mitigations.

References

• https://github.com/argoproj/argo-workflows
• https://github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca53d9
• https://github.com/argoproj/argo-workflows/releases/tag/v4.1.4
• https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4
• https://www.vulncheck.com/advisories/argo-workflows-4.1.0-through-4.1.3-cross-namespace-disclosure-via-negated-selector

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