CVE-2026-108860
Critical
Description
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductBotSharp
PublishedOct 11, 2026
First seenOct 11, 2026
Weakness typeCWE-321CWE-321
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| SciSharp BotSharp | v ≤ 5.2.0 | — |
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