Vulnerability details

CVE-2026-86259

THU-MAIC OpenMAIC

OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation

CVSS 4.0

9.0Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.0Critical	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
7.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N`

Affected products

Vendor	Product	Versions	Source
THU-MAIC	OpenMAIC	v < 1.0.1	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-09-06
Last updated: 2026-09-24
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.41%

Probability of exploitation in 30 days

36.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-918
Server-Side Request Forgery (SSRF)
CWE-306
Missing Authentication for Critical Function