Apache APISIX 3.16.0: JWTAuth Authentication Bypass via Spoofing
CVE-2026-39999 Published on June 19, 2026

Apache APISIX: JWT Algorithm Confusion allows authentication bypass
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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-39999 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE

Weakness Type

Authentication Bypass by Spoofing

This attack-focused weakness is caused by improperly implemented authentication schemes that are subject to spoofing attacks.


Products Associated with CVE-2026-39999

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Apache Apisix
 

Affected Versions

Apache Software Foundation Apache APISIX:

Exploit Probability

EPSS
0.42%
Percentile
34.80%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.