CVE-2026-82456: Binding to an Unrestricted IP Address in argoproj-labs argocd-mcp
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.
CVSS v4.0
Score 10.0critical
Affected software
argoproj-labs
argocd-mcp
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-82456 describes a critical security vulnerability in argocd-mcp 0.8.0 where the HTTP transport binds to every network interface and accepts MCP sessions without authentication when the ARGOCD_API_TOKEN environment variable is configured. This flaw enables remote attackers with network access to the listener to leverage the operator's token to fully control Argo CD resources, including creating applications and triggering sync operations. The affected versions are >=0.8.0 and <0.9.0. No patch or remediation details are provided in the input data.
Potential Impact
An attacker who can reach the exposed HTTP listener on argocd-mcp can use the operator's stored API token to perform unauthorized actions with full privileges on Argo CD resources. This includes creating new applications, requesting synchronization, and modifying existing resources, potentially leading to full compromise of the Argo CD environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the argocd-mcp service to trusted hosts only and avoid configuring ARGOCD_API_TOKEN in environments where the service is exposed to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-29T13:22:59.955Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a92e429acd9273b49d35869
Added to database: 08/29/2026, 13:52:41 UTC
Last enriched: 09/25/2026, 02:45:19 UTC
Last updated: 10/13/2026, 18:48:24 UTC
Views: 119
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