7.7High
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.
What this means for your business
- An attacker can use it remotely, over a network, with an ordinary user login, and without anyone at your company clicking anything.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
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Scoring
- CVSS
- 7.7 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N- CVSS v4
- 8.3
- Weakness
- CWE-639
- Assigned by
- disclosure@vulncheck.com
Dates
- Published
- 2026-09-19
- Last modified
- 2026-09-21
- Sources
- NVD
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