high7.5
CVE-2026-52844
Caddy: Windows `file_server` path authorization bypass via encoded backslash
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/caddyserver/caddy/v2 | < 2.11.4 | 2.11.4 |
| go | github.com/caddyserver/caddy | <= 1.0.5 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Caddyserver | Caddy | before 2.11.4 |