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: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: Elevated riskExposed: 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
76(Attend)
EG Risk 76/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 29, 2026

Last Modified

September 2, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
🔬 Proof of concept available. Patch available. Sources: github.
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

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
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 49× in last 7d / 153× 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.

Showing the most recent 100 of 153 total refreshes for this CVE.

  1. 2026-09-19 03:31 UTCGHSA enrichment
  2. 2026-09-18 23:08 UTCEG score recompute
  3. 2026-09-18 23:08 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:46 UTCGHSA enrichment
  6. 2026-09-18 14:23 UTCGHSA enrichment
  7. 2026-09-18 09:58 UTCGHSA enrichment
  8. 2026-09-18 05:35 UTCGHSA enrichment
  9. 2026-09-18 01:12 UTCGHSA enrichment
  10. 2026-09-17 20:50 UTCEG score recompute
  11. 2026-09-17 20:50 UTCGHSA enrichment
  12. 2026-09-17 13:04 UTCGHSA enrichment
  13. 2026-09-17 08:41 UTCGHSA enrichment
  14. 2026-09-17 04:18 UTCGHSA enrichment
  15. 2026-09-16 23:55 UTCGHSA enrichment
  16. 2026-09-16 19:32 UTCGHSA enrichment
  17. 2026-09-16 15:08 UTCEG score recompute
  18. 2026-09-16 15:08 UTCGHSA enrichment
  19. 2026-09-16 14:08 UTCEPSS rescore
  20. 2026-09-16 10:45 UTCGHSA enrichment
  21. 2026-09-16 06:20 UTCEG score recompute
  22. 2026-09-16 06:20 UTCGHSA enrichment
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-16 01:57 UTCGHSA enrichment
  25. 2026-09-15 21:34 UTCGHSA enrichment
Show 75 more
  1. 2026-09-15 17:10 UTCGHSA enrichment
  2. 2026-09-15 12:47 UTCGHSA enrichment
  3. 2026-09-15 08:24 UTCGHSA enrichment
  4. 2026-09-15 04:01 UTCEG score recompute
  5. 2026-09-15 04:01 UTCGHSA enrichment
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 23:36 UTCGHSA enrichment
  9. 2026-09-14 18:45 UTCGHSA enrichment
  10. 2026-09-14 13:43 UTCGHSA enrichment
  11. 2026-09-14 09:09 UTCGHSA enrichment
  12. 2026-09-14 04:46 UTCGHSA enrichment
  13. 2026-09-14 00:23 UTCGHSA enrichment
  14. 2026-09-13 20:01 UTCEG score recompute
  15. 2026-09-13 20:01 UTCGHSA enrichment
  16. 2026-09-13 15:38 UTCGHSA enrichment
  17. 2026-09-13 11:14 UTCGHSA enrichment
  18. 2026-09-13 06:51 UTCGHSA enrichment
  19. 2026-09-13 02:23 UTCGHSA enrichment
  20. 2026-09-12 21:59 UTCGHSA enrichment
  21. 2026-09-12 17:36 UTCEG score recompute
  22. 2026-09-12 17:36 UTCGHSA enrichment
  23. 2026-09-12 13:14 UTCGHSA enrichment
  24. 2026-09-12 08:51 UTCGHSA enrichment
  25. 2026-09-12 04:28 UTCGHSA enrichment
  26. 2026-09-12 00:05 UTCGHSA enrichment
  27. 2026-09-11 19:42 UTCGHSA enrichment
  28. 2026-09-11 15:19 UTCEG score recompute
  29. 2026-09-11 15:19 UTCGHSA enrichment
  30. 2026-09-11 14:53 UTCEPSS rescore
  31. 2026-09-11 14:53 UTCEPSS rescore
  32. 2026-09-11 10:56 UTCEG score recompute
  33. 2026-09-11 10:56 UTCGHSA enrichment
  34. 2026-09-11 06:33 UTCGHSA enrichment
  35. 2026-09-11 02:10 UTCGHSA enrichment
  36. 2026-09-10 21:47 UTCGHSA enrichment
  37. 2026-09-10 17:24 UTCGHSA enrichment
  38. 2026-09-10 13:01 UTCEG score recompute
  39. 2026-09-10 13:01 UTCGHSA enrichment
  40. 2026-09-10 08:38 UTCGHSA enrichment
  41. 2026-09-10 04:14 UTCGHSA enrichment
  42. 2026-09-09 23:51 UTCGHSA enrichment
  43. 2026-09-09 18:10 UTCGHSA enrichment
  44. 2026-09-09 13:47 UTCGHSA enrichment
  45. 2026-09-09 09:10 UTCGHSA enrichment
  46. 2026-09-09 04:47 UTCGHSA enrichment
  47. 2026-09-09 00:25 UTCEG score recompute
  48. 2026-09-09 00:25 UTCGHSA enrichment
  49. 2026-09-08 22:01 UTCEPSS rescore
  50. 2026-09-08 13:11 UTCGHSA enrichment
  51. 2026-09-08 08:43 UTCGHSA enrichment
  52. 2026-09-08 04:09 UTCGHSA enrichment
  53. 2026-09-07 23:45 UTCGHSA enrichment
  54. 2026-09-07 19:23 UTCEG score recompute
  55. 2026-09-07 19:23 UTCGHSA enrichment
  56. 2026-09-07 15:00 UTCGHSA enrichment
  57. 2026-09-07 09:57 UTCGHSA enrichment
  58. 2026-09-07 05:27 UTCGHSA enrichment
  59. 2026-09-07 00:58 UTCGHSA enrichment
  60. 2026-09-06 20:31 UTCGHSA enrichment
  61. 2026-09-06 16:07 UTCEG score recompute
  62. 2026-09-06 16:07 UTCGHSA enrichment
  63. 2026-09-06 13:48 UTCEPSS rescore
  64. 2026-09-06 11:42 UTCGHSA enrichment
  65. 2026-09-06 07:19 UTCGHSA enrichment
  66. 2026-09-06 02:56 UTCGHSA enrichment
  67. 2026-09-05 22:34 UTCGHSA enrichment
  68. 2026-09-05 18:11 UTCEG score recompute
  69. 2026-09-05 18:11 UTCGHSA enrichment
  70. 2026-09-05 15:31 UTCEPSS rescore
  71. 2026-09-05 13:45 UTCGHSA enrichment
  72. 2026-09-05 09:19 UTCGHSA enrichment
  73. 2026-09-05 04:56 UTCGHSA enrichment
  74. 2026-09-05 00:33 UTCGHSA enrichment
  75. 2026-09-04 20:11 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-82456.yaml
    First seen Jan 1, 2026

    argocd-mcp 0.8.0 - Unauthenticated MCP Session and Tool Access

    Open source ↗

Frequently asked(5)

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, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82456 actively exploited?
CVE-2026-82456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.0% of all scored CVEs.
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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