CVE-2026-45692

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

State: Published
Severity: 5.4 Medium
Published: Jun 23, 2026
Updated: Jun 26, 2026
Reserved: May 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N	GitHub_M

Weaknesses

CWE-187 Partial String Comparison
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
caddycaddyserver	>= 2.4.0, < 2.11.3Affected

References

https://github.com/caddyserver/caddy/security/advisories/GHSA-x5w9-xh9r-mvfc

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