CVE-2026-30851— Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation
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I. Basic Information for CVE-2026-30851
Vulnerability Information
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Vulnerability Title
Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation
Source: NVD (National Vulnerability Database)
Vulnerability Description
Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Caddy 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Caddy是Caddy公司的一款开源、跨平台的HTTP/Web服务器。 Caddy 2.10.0至2.11.2之前版本存在数据伪造问题漏洞，该漏洞源于forward_auth copy_headers未剥离客户端提供的标头，可能导致身份注入和权限提升。
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 |
|---|---|---|---|---|
| caddyserver | caddy | >= 2.10.0, < 2.11.2 | - |
II. Public POCs for CVE-2026-30851
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|---|
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IV. Related Vulnerabilities
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Same vendor: caddyserver
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Same weakness: CWE-287
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