CVE-2026-8890
code100x Mobile API Authentication Bypass via Header Spoofing
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| code100x code100x |
≥ 0; < 90b489ee7c63c301107d6374d4b3f2b8e4060fe5 (affected, custom) ≥ 0; < 88c6c5e94e23da101235c4c7e9c7591ac1016549 (affected, custom) Other versions: unknown |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.2 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N | CNA: VulnCheck |
| 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 | CNA: VulnCheck |
Exploit evidence
- https://github.com/code100x/cms/issues/1924
exploit · ADP: CISA-ADP - https://github.com/code100x/cms/pull/1927
exploit · ADP: CISA-ADP
References
- https://github.com/code100x/cms/issues/1924CNA: VulnCheck · issue-tracking
- https://github.com/code100x/cms/pull/1927CNA: VulnCheck · issue-tracking, patch
- https://github.com/code100x/cms/pull/1927/changes/90b489ee7c63c301107d6374d4b3f2b8e4060fe5CNA: VulnCheck · issue-tracking, patch
- https://github.com/code100x/cms/pull/1927/changes/88c6c5e94e23da101235c4c7e9c7591ac1016549CNA: VulnCheck · issue-tracking, patch
- https://www.vulncheck.com/advisories/code100x-mobile-api-authentication-bypass-via-header-spoofingCNA: VulnCheck · third-party-advisory
- https://github.com/code100x/cms/issues/1924ADP: CISA-ADP · exploit
- https://github.com/code100x/cms/pull/1927ADP: CISA-ADP · exploit
For agents and automation
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Endpoints and access details
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