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Vulnerability record · CVE-2026-86259 · published 6 September 2026

CVE-2026-86259: Missing authentication for critical function vulnerability

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.

9.0 CVSS 4.0 Critical EPSS 0.42% · top 66.7% CWE-306 · Missing authentication for critical functionCWE-918 · Server-side request forgery (SSRF) Deferred
9.0CVSS 4.0 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
10 Sep 2026Last modified by NVD

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: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:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-86259), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.