CVE-2026-8890: CODE100X

High severity, CVSS 8.2. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• CODE100X CODE100X: before 90b489ee7c63c301107d6374d4b3f2b8e4060fe5 (fixed in 90b489ee7c63c301107d6374d4b3f2b8e4060fe5); before 88c6c5e94e23da101235c4c7e9c7591ac1016549 (fixed in 88c6c5e94e23da101235c4c7e9c7591ac1016549)

Published 2026-05-26. Last modified 2026-07-23.