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CVE-2026-52844— Caddy: Windows `file_server` path authorization bypass via encoded backslash

CVSS 7.5 · High EPSS 0.41% · P33

Affected Version Matrix 1

VendorProductVersion RangeStatus
caddyservercaddy< 2.11.4affected
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I. Basic Information for CVE-2026-52844

Vulnerability Information
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Vulnerability Title
Caddy: Windows `file_server` path authorization bypass via encoded backslash
Source: NVD (National Vulnerability Database)
Vulnerability Description
Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
caddyserver caddy 路径遍历漏洞
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 2.11.4之前版本存在安全漏洞，该漏洞源于路径匹配器处理不当，在Windows系统上，未经身份验证的远程客户端可以绕过Caddy路径范围的认证/拒绝路由。
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 < 2.11.4 -

II. Public POCs for CVE-2026-52844

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8765 chars
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III. Intelligence Information for CVE-2026-52844

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Vendor Advisories for CVE-2026-52844 (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-2026-456925.4 MEDIUMCaddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization
CVE-2026-528464.2 MEDIUMCaddy: stripHTML template function bypass

IV. Related Vulnerabilities

Same product: caddy
Same vendor: caddyserver
Same weakness: CWE-22

V. Comments for CVE-2026-52844

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