{"id":"CVE-2026-82456","state":"PUBLISHED","title":"argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP","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.","publishedAt":"2026-08-29T13:47:57.447Z","updatedAt":"2026-09-24T14:20:30.930Z","severity":{"score":10,"label":"Critical","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["argoproj-labs argocd-mcp"],"affected":[{"vendor":"argoproj-labs","product":"argocd-mcp","defaultStatus":"unaffected","versions":[{"version":"0.8.0","status":"affected","lessThan":"0.9.0","versionType":"semver"}],"collectionURL":"https://github.com/argoproj-labs/mcp-for-argocd","repo":"https://github.com/argoproj-labs/mcp-for-argocd"}],"references":["https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr","https://github.com/argoproj-labs/mcp-for-argocd","https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http"],"weaknesses":["CWE-1327"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82456.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82456","state":"PUBLISHED","datePublished":"2026-08-29T13:47:57.447Z","dateUpdated":"2026-09-24T14:20:30.930Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-29T13:22:59.955Z"},"containers":{"cna":{"title":"argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"argoproj-labs","product":"argocd-mcp","defaultStatus":"unaffected","versions":[{"version":"0.8.0","status":"affected","lessThan":"0.9.0","versionType":"semver"}],"collectionURL":"https://github.com/argoproj-labs/mcp-for-argocd","repo":"https://github.com/argoproj-labs/mcp-for-argocd"}],"references":[{"url":"https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-rp45-5x3v-48mr)"},{"url":"https://github.com/argoproj-labs/mcp-for-argocd","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http","name":"VulnCheck Advisory: argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1327","lang":"en","description":"Binding to an Unrestricted IP Address","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-24T14:20:30.930Z"},"datePublic":"2026-08-25T00:00:00.000Z","credits":[{"lang":"en","value":"shmulc8","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T17:59:54.136197Z","id":"CVE-2026-82456","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-02T18:00:04.584Z"}}]}}}