Is CVE-2026-8890 actively exploited?

No active exploitation of CVE-2026-8890 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8890 be exploited remotely?

Yes. CVE-2026-8890 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8890?

CVE-2026-8890 has a CVSS score of 8.2 (HIGH).

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HIGH

CVE-2026-8890

CWE-639Published: May 26, 2026· Updated: May 26, 2026

8.2

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-8890 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.2.