CVE-2026-82456

CRITICAL 10.0CVE-2026-82456 · Published 29/08/2026 · updated 23/09/2026

In short

CVE-2026-82456 is a CRITICAL (CVSS 10.0) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 2.4%, higher than 83.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

argoproj-labs/mcp-for-argocd
argoproj-labs/mcp-for-argocd security advisory
vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free