Argo Workflows 4.1.0-4.1.3 Auth Bypass in ListArchivedWorkflows via Neg NS selector
CVE-2026-93991 Published on September 19, 2026
Argo Workflows 4.1.0 through 4.1.3 Cross-Namespace Disclosure via Negated Selector
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 Analysis
CVE-2026-93991 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2026-93991 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2026-93991
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Affected Versions
argoproj argo-workflows:- Version 4.1.0 and below 4.1.4 is affected.