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    CVE-2026-52844

    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.

    Published:Jun 23, 2026
    Last Modified:Jun 23, 2026
    EPS:Jun 23, 2026
    EPSS Score:
    CVSS Score:7.5

    Affected Products

    Vendor
    Caddyserver
    Product
    Caddy

    Exploits

    https://github.com/caddyserver/caddy/security/advisories/GHSA-qrp7-cvwr-j2c6https://github.com/caddyserver/caddy/security/advisories/GHSA-qrp7-cvwr-j2c6

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-126 Path Traversal
    CAPEC-19 Embedding Scripts within Scripts
    CAPEC-441 Malicious Logic Insertion
    CAPEC-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-578 Disable Security Software
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding

    Related CVEs

    CVE-2026-45135 (CVSS 8.1) — Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transpor…
    CVE-2026-45692 (CVSS 5.4) — Caddy is an extensible server platform that uses TLS by default. From 2.4.0 until 2.11.3, the authorization la…
    CVE-2026-52845 (CVSS 8.1) — Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers de…
    CVE-2026-52846 (CVSS 4.2) — Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template f…
    CVE-2026-30851 (CVSS 8.1) — Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2,…
    CVE-2026-30852 (CVSS 5.5) — Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, …
    CVE-2026-27590 (CVSS 8.9) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path…
    CVE-2026-27589 (CVSS 6.9) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admi…
    CVE-2026-27588 (CVSS 7.7) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` …
    CVE-2026-27587 (CVSS 7.7) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `path` …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High