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CVE-2026-45692— Caddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization

CVSS 5.4 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
caddyservercaddy>= 2.4.0, < 2.11.3affected
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I. Basic Information for CVE-2026-45692

Vulnerability Information
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Vulnerability Title
Caddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization
Source: CVE Program / CVE List V5
Vulnerability Description
Caddy is an extensible server platform that uses TLS by default. From 2.4.0 until 2.11.3, the authorization layer and the /config traversal layer do not agree on what object the path refers to. In this case, a path authorized for one config object is accepted, but then resolves to a different config object during traversal. This happens because the authorization layer uses string prefix matching and the /config traversal layer parses array indices numerically using strconv.Atoi(). This vulnerability is fixed in 2.11.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
部分比较
Source: CVE Program / CVE List V5
Vulnerability Title
caddyserver caddy 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
caddyserver caddy是caddyserver团队开源的一款Web服务器软件。 caddyserver caddy 2.4.0版本至2.11.3之前版本存在安全漏洞，该漏洞源于授权层和/config遍历层对路径引用对象不一致，授权层使用字符串前缀匹配而/config遍历层使用数值解析数组索引，可能导致路径授权绕过。
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

VendorProductAffected VersionsCPESubscribe
caddyservercaddy >= 2.4.0, < 2.11.3 -

II. Public POCs for CVE-2026-45692

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III. Intelligence Information for CVE-2026-45692

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Vendor Advisories for CVE-2026-45692 (1)

Same Patch Batch · caddyserver · 2026-06-23 · 5 CVEs total

CVE-2026-451358.1 HIGHCaddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files
CVE-2026-528458.1 HIGHCaddy: FastCGI header normalization bypass in `forward_auth copy_headers`
CVE-2026-528447.5 HIGHCaddy: Windows `file_server` path authorization bypass via encoded backslash
CVE-2026-528464.2 MEDIUMCaddy: stripHTML template function bypass

IV. Related Vulnerabilities

Same product: caddy
Same vendor: caddyserver
Same weakness: CWE-187

V. Comments for CVE-2026-45692

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