CVE-2026-8890
code100x Mobile API Authentication Bypass via Header Spoofing
- State
- Published
- Severity
- 8.8 High
- Published
- May 26, 2026
- Updated
- Jun 23, 2026
- Reserved
- May 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
code100xcode100x |
|
References
- https://github.com/code100x/cms/issues/1924issue-tracking
- https://github.com/code100x/cms/pull/1927issue-tracking
- https://github.com/code100x/cms/pull/1927/changes/90b489ee7c63c301107d6374d4b3f2b8e4060fe5issue-tracking
- https://github.com/code100x/cms/pull/1927/changes/88c6c5e94e23da101235c4c7e9c7591ac1016549issue-tracking
- https://www.vulncheck.com/advisories/code100x-mobile-api-authentication-bypass-via-header-spoofingthird-party-advisory
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