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CVE-2026-39999— Apache APISIX: JWT Algorithm Confusion allows authentication bypass

Quick assessment

Affected
Apache Software Foundation Apache APISIX
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache apisix是美国Apache基金会开源的一个动态API网关服务。 Apache APISIX 2.2版本至3.16.0及之前版本存在授权问题漏洞，该漏洞源于jwt-auth插件配置问题，可能导致攻击者完全绕过身份验证。

AI Predicted 9.1 Difficulty: Easy EPSS 0.64% · P50

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache APISIX 2.2≤ 3.16.0 affected
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I. Basic Information for CVE-2026-39999

Vulnerability Information
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Vulnerability Title
Apache APISIX: JWT Algorithm Confusion allows authentication bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Apache APISIX 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache apisix是美国Apache基金会开源的一个动态API网关服务。 Apache APISIX 2.2版本至3.16.0及之前版本存在授权问题漏洞，该漏洞源于jwt-auth插件配置问题，可能导致攻击者完全绕过身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache APISIX 2.2 ~ 3.16.0 -

II. Public POCs for CVE-2026-39999

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 11786 chars
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III. Intelligence Information for CVE-2026-39999

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Mailing List Discussions for CVE-2026-39999 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-19 · 12 CVEs total

CVE-2026-39998 Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
CVE-2026-44046 Apache APISIX: wolf-rbac plugin Identity Spoofing
CVE-2026-47339 Apache APISIX: authz-casdoor incorrect session sharing
CVE-2026-44087 Apache APISIX: Openid-connect plugin Identity Header Spoofing
CVE-2026-44915 Apache APISIX: Cas-auth plugin open redirect via unsanitized cookie value
CVE-2026-49230 Apache APISIX: Authentication bypass in jwe-decrypt
CVE-2026-49231 Apache APISIX: Identity spoofing issue in APISIX opa plugin
CVE-2026-48895 Apache APISIX: Cas-auth Host header influence on CAS service URL
CVE-2026-47341 Apache APISIX: Session replay issue in hmac-auth
CVE-2026-49871 Apache APISIX: cas-auth login CSRF / session injection issue
CVE-2026-49872 Apache APISIX: Improper authentication in cas-auth plugin

IV. Related Vulnerabilities

Same product: Apache APISIX
Same vendor: Apache Software Foundation
Same weakness: CWE-290

V. Comments for CVE-2026-39999

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