CVE-2026-39999

CRITICAL

Apache APISIX: JWT Algorithm Confusion allows authentication bypass

Title source: cna
STIX 2.1

Description

Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to upgrade to version v3.17.0, which fixes the issue.

References (2)

Core 2

Scores

CVSS v3 9.1
EPSS 0.0039
EPSS Percentile 30.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-290
Status published
Products (2)
apache/apisix 2.2 - 3.17.0
Apache Software Foundation/Apache APISIX 2.2 - 3.16.0
Published Jun 19, 2026
Tracked Since Jun 19, 2026