CVE-2026-52844CWE-22CWE-284

Caddy: Windows `file_server` path authorization bypass via encoded backslash

High · published June 23, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
48.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00619 · 48.7th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-284 · Improper Access Control
Published
2026-06-23T17:50Z
EPSS history
Timeline
  • 23 JUN 17:50Z
    Caddy: Windows `file_server` path authorization bypass via encoded backslash
    cvelistv5