CVE-2026-108860
CriticalCVSS 9.1Summary
BotSharp through 5.2.0 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to forge bearer tokens using the hard-coded Jwt:Key in WebStarter appsettings.json. Attackers can sign tokens with the committed HMAC secret and fixed botsharp issuer and audience to impersonate any known user, including administrators, on Authorize-protected API routes.
Risk Assessment
The risk of authentication bypass and impersonation of administrators can lead to unauthorized access to sensitive API functions and data. The organization may lose control over the system and expose data to compromise.
Recommendation
It is recommended to immediately upgrade BotSharp to a version newer than 5.2.0 and change the hard-coded JWT key to a random, secure secret. Also review authentication configuration and restrict access to API routes.
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Original NVD description (English source)
BotSharp through 5.2.0 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to forge bearer tokens using the hard-coded Jwt:Key in WebStarter appsettings.json. Attackers can sign tokens with the committed HMAC secret and fixed botsharp issuer and audience to impersonate any known user, including administrators, on Authorize-protected API routes.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS