CVE-2026-108860 BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key
Attackers can forge JWT tokens using a hard-coded key to impersonate any user, including administrators, on BotSharp API routes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108860?
CVE-2026-108860 is a critical vulnerability in SciSharp BotSharp, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-321
Which versions are affected by CVE-2026-108860?
How do I fix CVE-2026-108860?
No fix has been published for CVE-2026-108860 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-108860 being exploited?
There is no known exploitation of CVE-2026-108860 in the wild and no public exploit code.
Sources
Also known as GHSA-w9f8-hvcg-hgcm.