CVE-2026-25856: Openbullet OPENBULLET2

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

OpenBullet2 through version 0.3.2 contains an authenticated remote code execution vulnerability that allows authenticated users to execute arbitrary C# code on the server host by creating or modifying job configurations. Attackers can leverage the plain C# execution mode, which lacks reference filtering or API restrictions, to access the file system, spawn processes, and invoke arbitrary .NET APIs as the process user.

Affected products

• Openbullet OPENBULLET2: up to and including 0.3.2

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