CVE-2026-82456 (CVSS 10)

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.

Is your site exposed to CVE-2026-82456?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

10.0

CRITICAL

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

EPSS — Exploit Prediction

0.0173

Probability of exploitation

0.77%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1327 CWE-1327

References

Other References

https://github.com/argoproj-labs/mcp-for-argocd https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http

Frequently Asked Questions

What is CVE-2026-82456? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-82456? +

CVE-2026-82456 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0173, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-82456? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-0481

Unrestricted IP address binding in the AMD Device Metrics Exporter (ROCm ecosystem) could allow a remote attacker to perform unauthorized …

CVE-2026-72924

GitHub CLI (gh) is GitHub's official command line tool. Versions 2.28.0 through 2.97.0 bind the local listener created by gh …

CVE-2026-97849

The embedded Derby network service ignores its configured bind address and listens on all network interfaces. When the service is …

CVE-2026-111249

The development-time LiveReload support listens on all network interfaces without authentication and accepts websocket connections from any origin. A network …

CVE-2025-61934 10.0

A binding to an unrestricted IP address vulnerability was discovered in Productivity Suite software version v4.4.1.19. The vulnerability allows an …

CVE-2026-92559 9.8

IBM App Connect Enterprise 13.0.1.0 through 13.0.8.2 could allow a remote attacker to obtain sensitive information due to binding to …