CVE-2026-52844
Caddy: Windows `file_server` path authorization bypass via encoded backslash
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.
INFO
Published Date :
June 23, 2026, 5:50 p.m.
Last Modified :
June 23, 2026, 5:50 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update Caddy to 2.11.4 or later.
- Verify path matcher and file server behavior.
- Review access control configurations.
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