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.

CVSS v4.0

8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.47% chance of exploitation in the next 30 days, 39th percentile

Published

2026-06-08

Updated

2026-07-14

Proof-of-concept exploits (1)

• https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2

References

• CVE Record
• NVD entry

Related

• CVE-2026-25855
• CVE-2026-25857
• CVE-2026-25854
• CVE-2026-2586
• CVE-2026-25770
• CVE-2026-25860