---
id: CVE-2026-86259
title: >-
  OpenMAIC before 1.0.1 skips server-side request forgery validation in
  non-production builds, allowing unauthenticated attackers to reach cloud
  instance metadata services
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 he…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N'
cwe:
  - CWE-306
  - CWE-918
vendor: THU-MAIC
product: OpenMAIC
affected:
  - OpenMAIC < 1.0.1
published: '2026-09-06'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T19:58:20.507'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86259'
references:
  - url: 'https://github.com/THU-MAIC/OpenMAIC'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/app/api/generate/image/route.ts#L73-L78
    label: disclosure@vulncheck.com
  - url: 'https://github.com/THU-MAIC/OpenMAIC/blob/v1.0.0/middleware.ts#L60-L63'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/THU-MAIC/OpenMAIC/releases/tag/v1.0.1'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/THU-MAIC/OpenMAIC/security/advisories/GHSA-9m7h-vh2h-rc3w
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/openmaic-before-1.0.1-ssrf-via-environment-gated-url-validation
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/THU-MAIC/OpenMAIC/security/advisories/GHSA-9m7h-vh2h-rc3w
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00254
epssPercentile: 0.17322
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T13:34:05.798363Z'
ingestedAt: '2026-09-07T05:05:30.542Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/uziii2208/CVE-2026-86259'
  checkedAt: '2026-09-24T07:53:21.804Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.