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CVE-2026-108860— BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key

Quick assessment

Affected
SciSharp BotSharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BotSharp 5.2.0 及更早版本存在一个身份验证绕过漏洞，允许未经身份验证的远程攻击者利用 WebStarter 应用程序配置文件（WebStarter appsettings.json）中硬编码的 Jwt:Key 来伪造承载令牌（bearer tokens）。攻击者可以使用已提交到代码库中的 HMAC 密钥，以及固定的 botsharp 发行方（issuer）和受众（audience）对令牌进行签名，从而冒充任何已知用户（包括管理员），访问受身份验证保护的 API 路由。

CVSS 9.1 · Critical EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

Affected Version Matrix 1

VendorProduct Version RangeStatus
SciSharp BotSharp ≤ 5.2.0 affected
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I. Basic Information for CVE-2026-108860

Vulnerability Information
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Vulnerability Title
BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的密码学密钥
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SciSharp BotSharp 0 ~ 5.2.0 -

II. Public POCs for CVE-2026-108860

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III. Intelligence Information for CVE-2026-108860

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Patches & Fixes for CVE-2026-108860 (2)

Vendor Advisories for CVE-2026-108860 (1)

News Coverage for CVE-2026-108860 (1)

Other References for CVE-2026-108860 (1)

IV. Related Vulnerabilities

Same weakness: CWE-321

V. Comments for CVE-2026-108860

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