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CVE-2026-86259

CriticalPublished

OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation

Published: Sep 6, 2026
Updated: Sep 11, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 14, 2026

Primary CVSS

9.0/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 17.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-86259PoC
OpenMAIC 1.0.0: Unauthenticated Outbound SSRF to Cloud Metadata Service via Fail-Open Middleware and Environment-Gated Validation Bypass

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