CVE-2026-39998: Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup

[Abhishek Choudhary <shreemaanabhishek () apache org>]

Severity: 

Affected versions:

- Apache APISIX 2.12.0 through 3.16.0

Description:

Improper Input Validation vulnerability in Apache APISIX.

The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers.
This issue affects Apache APISIX: from 2.12.0 through 3.16.0.

Users are recommended to upgrade to version 3.16.1, which fixes the issue.

Credit:

Fernando Mecozzi (reporter)

References:

https://apisix.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-39998