CVE-2026-86259 OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation
Unauthenticated attackers can exploit SSRF in non-production builds to access cloud metadata and credentials via arbitrary URL parameters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86259?
CVE-2026-86259 is a critical server-side request forgery vulnerability in THU-MAIC OpenMAIC, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-86259?
How do I fix CVE-2026-86259?
No fix has been published for CVE-2026-86259 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-86259 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86259 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-6j8v-fv4p-986p, GHSA-9m7h-vh2h-rc3w.