Vulnerability · Published Sep 19, 2026 · Assigned by VulnCheck

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

High 7.7

In plain English

A high-severity authorization bypass via user-controlled key in argo-workflows from argoproj. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.4%top 61.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
argoproj	argo-workflows	4.1.0 – before 4.1.4

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-q65w-j2vp-47c4) vendor-advisory
https://github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca53d9 patch
argo-workflows v4.1.4 Release Notes release-notes
https://github.com/argoproj/argo-workflows product
VulnCheck Advisory: Argo Workflows 4.1.0 through 4.1.3 Cross-Namespace Disclosure via Negated Selector third-party-advisory