CVE-2026-108860CWE-321

CVE-2026-108860

Critical · published October 11, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
40.2
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00476 · 40.2th percentile
Weakness
CWE-321 · Use of Hard-coded Cryptographic Key
Published
2026-10-11T18:17Z
References (5)
https://github.com/SciSharp/BotSharp · [email protected]https://github.com/SciSharp/BotSharp/blob/a11ee0317cab5c619df1cb5d0c4fc39d1b6e30b4/src/Infrastructure/BotSharp.OpenAPI/BotSharpOpenApiExtensions.cs#L46-L57 · [email protected]https://github.com/SciSharp/BotSharp/blob/a11ee0317cab5c619df1cb5d0c4fc39d1b6e30b4/src/WebStarter/appsettings.json#L16-L20 · [email protected]https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/scisharp-botsharp-public-jwt-signing-key · [email protected]https://www.vulncheck.com/advisories/botsharp-through-5.2.0-authentication-bypass-via-hard-coded-jwt-signing-key · [email protected]
EPSS history
Timeline
  • 13 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 11 OCT 13:26Z
    BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key
    cvelistv5
  • 11 OCT 13:26Z
    BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key
    cvelistv5