OpenBullet2 0.3.2 Authenticated RCE via Job Configuration Interface
CVE-2026-25856

8.7HIGH

Key Information:

Vendor

Openbullet

Status
Openbullet2
Vendor
CVE Published:
8 June 2026

Badges

👾 Exploit Exists

What is CVE-2026-25856?

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 Version(s)

openbullet2 0 <= 0.3.2

References

https://hackernoon.com/one-empty-header-to-admin-how-an-a...
technical-descriptionexploit
https://www.vulncheck.com/advisories/openbullet2-authenti...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Maksim Rogov
VulnCheck
.