Authentication Bypass by Spoofing in Apache APISIX - CVE-2026-39999
Published: August 25, 2026
Vulnerability identifier: #VU145242
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-39999
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper authentication in jwt-auth plugin when processing certain configurations of JWT authentication. A remote attacker can spoof authentication data to bypass authentication.
Affected software
Apache APISIX
How to mitigate CVE-2026-39999
Install security update from vendor's website.
Apache APISIX - update to 3.16.1