Description
argocd-mcp 0.8.0 binds its HTTP transport to every network interface and accepts MCP sessions without requiring caller credentials when ARGOCD_API_TOKEN is configured. Attackers who can reach the listener can invoke the full tool surface using the operator's stored token to create applications, request syncs, and modify Argo CD resources.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| argoproj-labs | argocd-mcp | 0.8.0 – < 0.9.0 | 0.9.0 |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- argocd-mcp 0.8.0 - Unauthenticated MCP Session and Tool Access http/cves/2026/CVE-2026-82456.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
References
- GitHub Security Advisory (GHSA-rp45-5x3v-48mr) vendor-advisory
- https://github.com/argoproj-labs/mcp-for-argocd product
- VulnCheck Advisory: argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP third-party-advisory