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CVE-2026-8890— code100x Mobile API Authentication Bypass via Header Spoofing

Quick assessment

Affected
code100x code100x
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

100xDevs CMS是code100x开源的一个内容管理系统的开源仓库。 100xDevs CMS存在安全漏洞，该漏洞源于Mobile API中存在身份验证绕过，可能导致未经身份验证的攻击者通过提供特制JSON有效载荷来冒充任意用户。

CVSS 8.2 · High EPSS 0.49% · P40

Affected Version Matrix 2

VendorProduct Version RangeStatus
code100x code100x < 90b489ee7c63c301107d6374d4b3f2b8e4060fe5 affected
< 88c6c5e94e23da101235c4c7e9c7591ac1016549 affected
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I. Basic Information for CVE-2026-8890

Vulnerability Information
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Vulnerability Title
code100x Mobile API Authentication Bypass via Header Spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
code100x contains an authentication bypass vulnerability in the Mobile API that allows unauthenticated attackers to impersonate arbitrary users by supplying a crafted JSON payload in the 'g' HTTP header. The middleware in middleware.ts skips identity header generation when an Auth-Key header is present without validating its value, allowing attackers to inject a spoofed user identity header that the downstream route handler in the mobile courses endpoint accepts as trusted, granting unauthorized access to course data belonging to any enrolled user or administrator.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
100xDevs CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
100xDevs CMS是code100x开源的一个内容管理系统的开源仓库。 100xDevs CMS存在安全漏洞，该漏洞源于Mobile API中存在身份验证绕过，可能导致未经身份验证的攻击者通过提供特制JSON有效载荷来冒充任意用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
code100x code100x 0 ~ 90b489ee7c63c301107d6374d4b3f2b8e4060fe5 -

II. Public POCs for CVE-2026-8890

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6222 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-8890

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Patches & Fixes for CVE-2026-8890 (2)

Other References for CVE-2026-8890 (2)

IV. Related Vulnerabilities

Same weakness: CWE-639

V. Comments for CVE-2026-8890

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