CVE-2026-25555: Openbullet OPENBULLET2

Critical severity, CVSS 9.8. EPSS: 2.7% chance of exploitation in the next 30 days.

OpenBullet2 through version 0.3.2 contains an authentication bypass vulnerability in the API key authentication middleware that allows unauthenticated attackers to gain admin access by supplying an empty X-Api-Key header value. Attackers can exploit the middleware's comparison of the supplied header against an empty AdminApiKey default string to access the admin console and all API endpoints without valid credentials.

Affected products

• Openbullet OPENBULLET2: up to and including 0.3.2

Published 2026-06-08. Last modified 2026-07-23.