CVE-2026-45692CWE-187CWE-863

Caddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization

Medium · published June 23, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
14.4
In the wild
Unconfirmed
What it is

Caddy is an extensible server platform that uses TLS by default. From 2.4.0 until 2.11.3, the authorization layer and the /config traversal layer do not agree on what object the path refers to. In this case, a path authorized for one config object is accepted, but then resolves to a different config object during traversal. This happens because the authorization layer uses string prefix matching and the /config traversal layer parses array indices numerically using strconv.Atoi(). This vulnerability is fixed in 2.11.3.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00241 · 14.4th percentile
Weaknesses
CWE-187 · Partial String Comparison; CWE-863 · Incorrect Authorization
Published
2026-06-23T17:55Z
EPSS history
Timeline
  • 23 JUN 17:55Z
    Caddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization
    cvelistv5