CVE-2026-82456

argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

Published Aug 29, 2026 CVSS 4.0 · 10 Critical EPSS 2.4% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Argoproj-labs
Argoproj-labs argocd-mcp
Vendors & Products Argoproj-labs
Argoproj-labs argocd-mcp
Type Values Removed Values Added
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.
Title argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP
Weaknesses CWE-1327
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 10, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 24, 2026, 2:20 PM
Reserved
Aug 29, 2026, 1:22 PM
Status
Deferred
Published
Aug 29, 2026, 2:16 PM
Modified
Sep 23, 2026, 5:17 PM