{"id":"CVE-2026-82456","summary":"argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP","details":"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.","aliases":["GHSA-rp45-5x3v-48mr"],"modified":"2026-09-03T03:30:26.664244507Z","published":"2026-08-29T13:47:57.447Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-1327"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82456.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82456.json"},{"type":"ADVISORY","url":"https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82456"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http"},{"type":"PACKAGE","url":"https://github.com/argoproj-labs/mcp-for-argocd"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/argoproj-labs/mcp-for-argocd","events":[{"introduced":"25589071381e66505fd7e2da41f7b305b98bfd8c"},{"fixed":"28d15ca69b0c31387cc6ec73d201fd13c5d22b6a"}],"database_specific":{"extracted_events":[{"introduced":"0.8.0"},{"fixed":"0.9.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82456.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}