SciSharp BotSharp up to 5.2.0 JWT appsettings.json improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in SciSharp BotSharp up to 5.2.0. This issue affects some unknown processing of the file appsettings.json of the component JWT. Executing a manipulation can lead to improper authorization. This vulnerability is tracked as CVE-2026-108860. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in SciSharp BotSharp up to 5.2.0. It has been declared as critical. This vulnerability affects an unknown functionality of the file appsettings.json of the component JWT. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at hackmd.io. This vulnerability was named CVE-2026-108860 since 10/11/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/11/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

By approaching the search of inurl:appsettings.json it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• SciSharp

Name

• BotSharp

Version

• 5.0
• 5.1
• 5.2.0

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