CVE-2026-75627 Bastillion Authentication Bypass via Path-Prefix Routing Mismatch
Unauthenticated attackers can bypass authentication to create admin accounts and manage SSH access, leading to full control of the managed fleet.
- 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-2026-75627?
CVE-2026-75627 is a critical authentication bypass vulnerability in bastillion-io Bastillion, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Bastillion fails to properly validate request URI paths in its controller dispatcher, allowing unauthenticated attackers to bypass authentication filters by prefixing requests with arbitrary path segments. Attackers can access administrative controllers to read user listings, create manager accounts, and register managed systems, gaining control over SSH access to the managed fleet.
Weakness: CWE-288
Which versions are affected by CVE-2026-75627?
How do I fix CVE-2026-75627?
No fix has been published for CVE-2026-75627 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-75627 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75627 exists.
Sources
Also known as GHSA-9v44-g22g-qfg5.