CVE-2026-25856
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
Vulnerability in OpenBullet2 up to version 0.3.2: authenticated remote code execution via creating or modifying job configurations. The plain C# execution mode lacks reference filtering, allowing access to the file system, process spawning, and arbitrary .NET API calls.
Risk Assessment
Risk of full server compromise by an authenticated user, potentially leading to loss of confidentiality, integrity, and availability.
Recommendation
Update OpenBullet2 to the latest version. Restrict access to trusted users and monitor job configurations.
Other vulnerabilities in OpenBullet2
See all- CVE-2026-25555Critical
OpenBullet2 through version 0.3.2 has an authentication bypass vulnerability in the API key authentication middleware. Unauthenticated attackers can gain admin access by supplying an empty X-Api-Key header value, as it is compared against a default empty AdminApiKey string.
- CVE-2026-39908Medium
OpenBullet2 up to version 0.3.2 on Windows has a credential disclosure vulnerability. A remote attacker can configure a proxy source with a UNC path pointing to an attacker-controlled server, causing the application to attempt SMB authentication and leak the NTLMv2 hash of the process user.
- CVE-2026-25855High
A vulnerability in OpenBullet2 through version 0.3.2 allows authenticated users to execute arbitrary commands by uploading script files (.bat, .ps1, .sh) through the FileProxySource proxy loading feature. Attackers can upload malicious script files as proxy sources, causing the server to execute the scripts and return output as proxy lines, resulting in arbitrary command execution on the host as the process user.
- CVE-2026-25559High
OpenBullet2 through version 0.3.2 contains a path traversal vulnerability in the wordlist endpoint, allowing authenticated attackers to read, write, and delete arbitrary files by supplying unsanitized absolute paths. Attackers can chain these operations to achieve remote code execution by manipulating critical system files such as /etc/passwd, as the application runs as root by default.
Original NVD description (English source)
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.