What is CVE-2026-86259?

CVE-2026-86259 is a high-severity vulnerability in Thu-Maic Openmaic, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-06.

How severe is CVE-2026-86259?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Thu-Maic Openmaic

CVE-2026-86259

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.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N.

Affected products

Thu-maic Openmaic

Weakness classification (CWE)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (release-notes, patch)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86259?: CVE-2026-86259 is a high-severity vulnerability in Thu-Maic Openmaic, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-06.
How severe is CVE-2026-86259?: High severity. CVSS v3 base score is 7.5 out of 10.