CVE-2026-86259: OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-06 · updated 2026-09-10
Weakness: CWE-306

Description

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.

Affected products

THU-MAIC OpenMAIC: before 1.0.1 — fixed in 1.0.1

How to fix

Upgrade to a fixed version: THU-MAIC OpenMAIC 1.0.1. Check the vendor advisory for mitigations.

References

https://github.com/THU-MAIC/OpenMAIC
https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/app/api/generate/image/route.ts#L73-L78
https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/middleware.ts#L60-L63
https://github.com/THU-MAIC/OpenMAIC/releases/tag/v1.0.1
https://github.com/THU-MAIC/OpenMAIC/security/advisories/GHSA-9m7h-vh2h-rc3w
https://www.vulncheck.com/advisories/openmaic-before-1.0.1-ssrf-via-environment-gated-url-validation
https://github.com/THU-MAIC/OpenMAIC/security/advisories/GHSA-9m7h-vh2h-rc3w

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