# CVE-2026-86259

## Summary

- **CVE ID:** CVE-2026-86259
- **Severity:** CRITICAL
- **CVSS Score:** 9 (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)
- **CWE:** CWE-918, CWE-306
- **Published:** Sep 6, 2026
- **Last Modified:** Sep 11, 2026

## 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 (0)
- THU-MAIC — OpenMAIC (1.0.1)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 17.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._