Which products and versions are affected by CVE-2026-82456?

Affected: argocd-mcp versions >= 0.8.0. The full list is in the CVE brief.

Is CVE-2026-82456 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-82456 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-82456?

Public exploit code is available.

Is there a fix for CVE-2026-82456?

Fixed versions are available, including argocd-mcp 0.9.0.

How urgently should CVE-2026-82456 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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Vulnerability Intelligence

CVE-2026-82456

CriticalPublic exploit

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.

Published Aug 29, 2026 · Updated Sep 25, 2026 · Also known as EUVD-2026-68103, GHSA-p2x5-x87w-v2xj, GHSA-rp45-5x3v-48mr

Key Facts

Patch immediately

CVE-2026-82456 is a critical-severity vulnerability (CVSS 10.0 v4) affecting argocd-mcp.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 1.7% probability of exploitation in the next 30 days.
Fixed versions are available, including argocd-mcp 0.9.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

CVSS v4

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

EPSS (30-day exploit likelihood)

1.7%

Higher than 77.2% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-82456 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
argocd-mcp	>= 0.8.0	0.9.0

Patched Releases

argocd-mcp

0.9.0

Timeline

Publicly disclosed
Aug 29, 2026
Last updated
Sep 25, 2026

Weakness Type

CWE-1327 Binding to an Unrestricted IP Address

References

FAQ

Common Questions.

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.
Affected: argocd-mcp versions >= 0.8.0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including argocd-mcp 0.9.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2026-82456 Running On Your Attack Surface?

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