CVE-2026-82456

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-29. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 3 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 29, 2026

Last Modified

August 29, 2026

Advisory Details (3)

Auto-updated Aug 29, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

argocd-mcp 0.8.0 Authentication Bypass via Unauthenticated HTTP | Advisories | VulnCheck

https://www.vulncheck.com/advisories/argocd-mcp-0.8.0-authentication-bypass-via-unauthenticated-http
github Patch Available🟡 PoC Available

Binding to an Unrestricted IP Address in argocd-mcp · Advisory · argoproj-labs/mcp-for-argocd · GitHub

https://github.com/argoproj-labs/mcp-for-argocd/security/advisories/GHSA-rp45-5x3v-48mr
generic

GitHub - argoproj-labs/mcp-for-argocd: An implementation of Model Context Protocol (MCP) server for Argo CD. · GitHub

https://github.com/argoproj-labs/mcp-for-argocd

Vendor Advisories for CVE-2026-82456(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 03:33 UTCGHSA enrichment
  2. 2026-08-29 23:10 UTCGHSA enrichment
  3. 2026-08-29 18:47 UTCEG score recompute
  4. 2026-08-29 18:47 UTCGHSA enrichment
  5. 2026-08-29 14:23 UTCEG score recompute
  6. 2026-08-29 13:53 UTCEG score recompute
  7. 2026-08-29 13:52 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-82456?
CVE-2026-82456 is a critical vulnerability published on August 29, 2026. argocd-mcp 0.8.0 binds its HTTP transport to every network interface and accepts MCP sessions without requiring caller credentials when ARGOCDAPITOKEN is configured. Attackers who can reach the listener can invoke the full tool surface using the operator's stored token to create applications,…
When was CVE-2026-82456 disclosed?
CVE-2026-82456 was first published in the National Vulnerability Database on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-82456?
CVE-2026-82456 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-82456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82456, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-82456

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