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CVE-2026-82456

argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

CVSS 4.0 10.0 CRITICALCVSS 3.1 10.0 CRITICALCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-82456

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-82456

Published

argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP

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.

Source published
29 Aug 2026 13:47:57 UTC
Source modified
24 Sep 2026 14:20:30 UTC
Saved here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 10.0 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

CVSS 3.1 · 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

ChangeIntel

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Sources read 12 Nov 13:19 UTC · 273 of 275 readable · 271 fully read · documentation 469/469 current

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