Caddy <=2.11.2 auth/traversal mismatch on config objects
CVE-2026-45692 Published on June 23, 2026
Caddy: Remote Admin Authorization Bypass in `/config` API via Array Index Normalization
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.
Vulnerability Analysis
CVE-2026-45692 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Types
Partial String Comparison
The software performs a comparison that only examines a portion of a factor before determining whether there is a match, such as a substring, leading to resultant weaknesses. For example, an attacker might succeed in authentication by providing a small password that matches the associated portion of the larger, correct password.
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-45692 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-45692
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