CVE-2026-8890

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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/code100x/cms/issues/1924
https://github.com/code100x/cms/pull/1927
https://github.com/code100x/cms/pull/1927/changes/88c6c5e94e23da101235c4c7e9c7591ac1016549
https://github.com/code100x/cms/pull/1927/changes/90b489ee7c63c301107d6374d4b3f2b8e4060fe5
https://www.vulncheck.com/advisories/code100x-mobile-api-authentication-bypass-via-header-spoofing
https://github.com/code100x/cms/issues/1924
https://github.com/code100x/cms/pull/1927

Configurations

No configuration.

History

26 May 2026, 20:16

Type	Values Removed	Values Added
References	~~() https://github.com/code100x/cms/issues/1924 -~~	() https://github.com/code100x/cms/issues/1924 -
References	~~() https://github.com/code100x/cms/pull/1927 -~~	() https://github.com/code100x/cms/pull/1927 -

26 May 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-26 19:16

Updated : 2026-05-26 20:16

NVD link : CVE-2026-8890

Mitre link : CVE-2026-8890

CVE.ORG link : CVE-2026-8890

JSON object : View

Products Affected

No product.

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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