CVE-2026-82456

CriticalPublished

argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

Published: Aug 29, 2026
Updated: Sep 24, 2026
Assigning CNA: VulnCheck

Primary CVSS

10.0/ 10Critical

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

1.7%

Low · next 30 days

Percentile: 77.4%
Model date: Oct 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Repository evidence: Files: 1 · Repositories: 1

1 Template

argocd-mcp 0.8.0 - Unauthenticated MCP Session and Tool AccessTemplate
http/cves/2026/CVE-2026-82456.yaml
Nuclei Templates
DetectionEvidence observed: Sep 26, 2026Revision: 1f4c3f6568abRelated tool
Declared conditions
- network: http($.protocol_keys)
- verification: dsl($.matchers[*].type)

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