by Kastro
Paper/Archive/CVE-2026-82456

CVE-2026-82456

argoproj-labs argocd-mcp — argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

EPSS 2%public exploitCVSS 10.0
critical.is priorityof 100
57
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 83.8.838 × 2016.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
argocd-mcp0.8.0 – < 0.9.00.9.0CNA

Scores by source

VulnCheck (CNA)10.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mrrefgithub.com/argoproj-labs/mcp-for-argocdwriteupvulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http