High severity · published Sep 19, 2026
CVE-2026-93991
Argo Workflows 4.1.0 through 4.1.3 Cross-Namespace Disclosure via Negated Selector
7.7
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AR
argo-workflows · argoproj
4.1.0 before 4.1.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93991
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93991
github.com
https://github.com/argoproj/argo-workflows
github.com
https://github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca53d9
github.com
https://github.com/argoproj/argo-workflows/releases/tag/v4.1.4
github.com
https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4
www.vulncheck.com
https://www.vulncheck.com/advisories/argo-workflows-4.1.0-through-4.1.3-cross-namespace-disclosure-via-negated-selector
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