CVE-2026-86259

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-06. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

OpenMAIC before 1.0.1 skips server-side request forgery validation in non-production builds, allowing unauthenticated attackers to reach cloud instance metadata services. Attackers can supply arbitrary provider URLs via the x-base-url header or baseUrl parameter to access sensitive cloud credentials and metadata.

CVSS v3
7.5
EG Score
7.5(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
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

September 6, 2026

Last Modified

September 11, 2026

Advisory Details (6)

Auto-updated Sep 6, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
generic

OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openmaic-before-1.0.1-ssrf-via-environment-gated-url-validation
generic

GitHub - THU-MAIC/OpenMAIC: Open Multi-Agent Interactive Classroom — Get an immersive, multi-agent learning experience in just one click · GitHub

https://github.com/THU-MAIC/OpenMAIC
github_release Patch Available

OpenMAIC v1.0.1 — Security and stability

Patch available: THU-MAIC/OpenMAIC v1.0.1

https://github.com/THU-MAIC/OpenMAIC/releases/tag/v1.0.1
generic

OpenMAIC/app/api/generate/image/route.ts at v1.0.0 · THU-MAIC/OpenMAIC · GitHub

https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/app/api/generate/image/route.ts#L73-L78
generic

OpenMAIC/middleware.ts at v1.0.0 · THU-MAIC/OpenMAIC · GitHub

https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/middleware.ts#L60-L63
github Patch Available🟡 PoC Available

Unauthenticated Outbound SSRF to Cloud Metadata Service via Fail-Open Middleware and Environment-Gated Validation Bypass · Advisory · THU-MAIC/OpenMAIC · GitHub

https://github.com/THU-MAIC/OpenMAIC/security/advisories/GHSA-9m7h-vh2h-rc3w

Vendor Advisories for CVE-2026-86259(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 58× 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. 2026-09-20 08:57 UTCGHSA enrichment
  2. 2026-09-19 21:06 UTCEG score recompute
  3. 2026-09-19 21:05 UTCGHSA enrichment
  4. 2026-09-19 09:14 UTCGHSA enrichment
  5. 2026-09-18 21:22 UTCEG score recompute
  6. 2026-09-18 21:22 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 09:23 UTCGHSA enrichment
  9. 2026-09-17 21:32 UTCEG score recompute
  10. 2026-09-17 21:32 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-17 09:41 UTCGHSA enrichment
  13. 2026-09-16 21:50 UTCEG score recompute
  14. 2026-09-16 21:50 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-16 09:59 UTCEG score recompute
  17. 2026-09-16 09:59 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 22:08 UTCGHSA enrichment
  20. 2026-09-15 10:16 UTCEG score recompute
  21. 2026-09-15 10:16 UTCGHSA enrichment
  22. 2026-09-15 03:12 UTCEPSS rescore
  23. 2026-09-15 03:12 UTCEPSS rescore
  24. 2026-09-14 22:24 UTCGHSA enrichment
  25. 2026-09-14 10:29 UTCGHSA enrichment
Show 33 more
  1. 2026-09-13 22:38 UTCEG score recompute
  2. 2026-09-13 22:38 UTCGHSA enrichment
  3. 2026-09-13 10:47 UTCGHSA enrichment
  4. 2026-09-12 22:56 UTCEG score recompute
  5. 2026-09-12 22:56 UTCGHSA enrichment
  6. 2026-09-12 11:05 UTCGHSA enrichment
  7. 2026-09-11 23:14 UTCEG score recompute
  8. 2026-09-11 23:14 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 11:19 UTCEG score recompute
  12. 2026-09-11 11:18 UTCGHSA enrichment
  13. 2026-09-11 07:56 UTCGHSA enrichment
  14. 2026-09-10 20:04 UTCGHSA enrichment
  15. 2026-09-10 14:36 UTCEG score recompute
  16. 2026-09-10 14:36 UTCGHSA enrichment
  17. 2026-09-10 02:45 UTCGHSA enrichment
  18. 2026-09-09 14:54 UTCGHSA enrichment
  19. 2026-09-09 03:03 UTCEG score recompute
  20. 2026-09-09 03:03 UTCGHSA enrichment
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-08 15:11 UTCEG score recompute
  23. 2026-09-08 15:10 UTCGHSA enrichment
  24. 2026-09-08 14:12 UTCEG score recompute
  25. 2026-09-08 14:12 UTCGHSA enrichment
  26. 2026-09-08 01:59 UTCEG score recompute
  27. 2026-09-08 01:59 UTCGHSA enrichment
  28. 2026-09-07 14:07 UTCGHSA enrichment
  29. 2026-09-07 01:15 UTCEG score recompute
  30. 2026-09-07 01:15 UTCGHSA enrichment
  31. 2026-09-06 13:24 UTCEG score recompute
  32. 2026-09-06 12:44 UTCEG score recompute
  33. 2026-09-06 12:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86259?
CVE-2026-86259 is a high vulnerability published on September 6, 2026. OpenMAIC before 1.0.1 skips server-side request forgery validation in non-production builds, allowing unauthenticated attackers to reach cloud instance metadata services. Attackers can supply arbitrary provider URLs via the x-base-url header or baseUrl parameter to access sensitive cloud…
When was CVE-2026-86259 disclosed?
CVE-2026-86259 was first published in the National Vulnerability Database on September 6, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86259 actively exploited?
CVE-2026-86259 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 82.6% of all scored CVEs.
What is the CVSS score of CVE-2026-86259?
CVE-2026-86259 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-86259?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86259, 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

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