CVE-2026-25555
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk72th percentile - higher than 72% of all known CVEs
Summary
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.
Risk Assessment
An attacker can gain full access to the admin console and all API endpoints without valid credentials, leading to complete compromise of the application and its data.
Recommendation
Immediately upgrade OpenBullet2 to a version later than 0.3.2 and configure a strong, non-empty API key.
Other vulnerabilities in OpenBullet2
See all- 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-2026-25856High
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.
- 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 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS