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

Quick assessment

Affected
Apache Software Foundation Apache APISIX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 2.12.0版本至3.16.0及之前版本存在输入验证错误漏洞，该漏洞源于输入验证不当，可能导致攻击者利用forward-auth插件中的配置来伪造身份标头。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache APISIX 2.12.0≤ 3.16.0 affected
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I. Basic Information for CVE-2026-39998

Vulnerability Information
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Vulnerability Title
Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
Source: CVE Program / CVE List V5
Vulnerability 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 3.17.0, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache APISIX 输入验证错误漏洞
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 2.12.0版本至3.16.0及之前版本存在输入验证错误漏洞，该漏洞源于输入验证不当，可能导致攻击者利用forward-auth插件中的配置来伪造身份标头。
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 2.12.0 ~ 3.16.0 -

II. Public POCs for CVE-2026-39998

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III. Intelligence Information for CVE-2026-39998

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Mailing List Discussions for CVE-2026-39998 (1)

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

CVE-2026-39999 Apache APISIX: JWT Algorithm Confusion allows authentication bypass
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-20

V. Comments for CVE-2026-39998

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