CVE-2026-8890: code100x · Insecure Direct Object Reference
Affects code100xSource CVE Database V5
Public exploit available · CVSS 8.2 High.
Data as of 8 Nov 2026, 14:21 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 3.1 | 8.2 |
|---|---|---|
| CNA (VulnCheck) | CVSS 4.0 | 8.8 |
- CISA SSVC
- Exploitation
- Proof of concept is public or traded
- Automatable
- Attackers can reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-05-26.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:NExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 26 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by VulnCheck
, 8 days before disclosure
CVE published
on cve.org
, t = 0
CISA SSVC assessment
proof of concept public
, 1 hour after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| code100xcode100x | Affected
| Fixed in– |
AI-suggested
Users of code100x version 0 should implement additional access controls or input validation as a temporary mitigation. Monitor vendor advisories for updates and apply official patches once released.
Description
code100x version 0 contains an authentication bypass vulnerability in its Mobile API. An attacker can impersonate arbitrary users by sending a crafted JSON payload in the 'g' HTTP header. The middleware fails to validate the 'Auth-Key' header value, allowing spoofing of user identity headers that downstream handlers trust, leading to unauthorized access to course data of any enrolled user or administrator.
References
- github.com/code100x/cms/issues/1924 (opens in a new tab)
- github.com/code100x/cms/pull/1927 (opens in a new tab)
- github.com/code100x/cms/pull/1927/changes/90b489ee7c63c301107d6374d4b3f2b8e4060fe5 (opens in a new tab)
- github.com/code100x/cms/pull/1927/changes/88c6c5e94e23da101235c4c7e9c7591ac1016549 (opens in a new tab)
- vulncheck.com/advisories/code100x-mobile-api-authentication-bypass-via-header-spoofing (opens in a new tab)