CVE-2026-82456 Details.
argocd-mcp 0.8.0 - Unauthenticated MCP Session and Tool Access
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-82456. What It Means.
argocd-mcp before 0.9.0 binds its MCP HTTP listener to all interfaces without requiring authentication. A remote unauthenticated attacker can initialize an MCP session, complete the handshake, and enumerate or invoke the full Argo CD tool surface using the operator's stored API token.
Affected Product. What Is Hit.
- Vendor
- argoproj-labs
- Product
- Argoproj Labs MCP For Argocd
References. Where To Read More.
FAQ
Common Questions.
argocd-mcp 0.8.0 - Unauthenticated MCP Session and Tool Access. argocd-mcp before 0.9.0 binds its MCP HTTP listener to all interfaces without requiring authentication. A remote unauthenticated attacker can initialize an MCP session, complete the handshake, and enumerate or invoke the full Argo CD tool surface using the operator's stored API token.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-82456 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-82456 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Argoproj Labs MCP For Argocd to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-82456. Atlas does not run a check for it, so nothing here says whether a particular site is affected.