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CVE-2026-31908— Apache APISIX: forward auth plugin allows header injection

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是美国阿帕奇（Apache）基金会的一个云原生的微服务API网关服务。该软件基于 OpenResty 和 etcd 来实现，具备动态路由和插件热加载，适合微服务体系下的 API 管理。 Apache Apisix 2.12.0至3.15.0版本存在安全漏洞，该漏洞源于forward-auth插件配置问题，可能导致攻击者注入恶意标头。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-31908

Vulnerability Information
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Vulnerability Title
Apache APISIX: forward auth plugin allows header injection
Source: CVE Program / CVE List V5
Vulnerability Description
Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特殊命令到另一不同平面时的净化处理不恰当(特殊命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Apisix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Apisix是美国阿帕奇（Apache）基金会的一个云原生的微服务API网关服务。该软件基于 OpenResty 和 etcd 来实现，具备动态路由和插件热加载，适合微服务体系下的 API 管理。 Apache Apisix 2.12.0至3.15.0版本存在安全漏洞，该漏洞源于forward-auth插件配置问题，可能导致攻击者注入恶意标头。
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 ~ 3.15.0 -

II. Public POCs for CVE-2026-31908

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III. Intelligence Information for CVE-2026-31908

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Same Patch Batch · Apache Software Foundation · 2026-04-14 · 4 CVEs total

CVE-2026-31923 Apache APISIX: Openid-connect `tls_verify` field is disabled by default
CVE-2026-33929 Apache PDFBox Examples: Path Traversal in PDFBox ExtractEmbeddedFiles Example Code
CVE-2026-31924 Apache APISIX: Plugin tencent-cloud-cls log export uses plaintext HTTP

IV. Related Vulnerabilities

Same product: Apache APISIX
Same vendor: Apache Software Foundation
Same weakness: CWE-75

V. Comments for CVE-2026-31908

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