Authorization Bypass Through User-Controlled Key Affecting github.com/argoproj/argo-workflows/v4/server/workflowarchive package, versions >=4.1.0 <4.1.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMARGOPROJARGOWORKFLOWSV4SERVERWORKFLOWARCHIVE-20046684
- published22 Sept 2026
- disclosed20 Sept 2026
- creditthesecguy45, euriconicacio
Introduced: 20 Sep 2026
NewCVE-2026-93991 (opens in a new tab)How to fix?
Upgrade github.com/argoproj/argo-workflows/v4/server/workflowarchive to version 4.1.4 or higher.
Overview
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the ListArchivedWorkflows handler in server/workflowarchive/archived_workflow_server.go. An attacker can read archived workflows from other namespaces by sending a metadata.namespace!=<their-namespace> field selector while having only namespace-scoped list permission in their own namespace. The handler authorizes the request against the attacker-supplied namespace and then runs the negated query, so the access review succeeds for the caller’s namespace while the archive listing returns records from every other namespace. This exposes archived workflow metadata, including arguments, parameter values, annotations, and error details, to an authenticated user who should only be able to list workflows in a single namespace.