CVE-2026-27589
MEDIUM
GHSA-879p-475x-rqh2
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Description
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue.
Analysis
Caddy versions prior to 2.11.1 allow unauthenticated cross-origin requests to the admin API when origin enforcement is disabled, enabling attackers to remotely reconfigure the server through malicious web content loaded in a victim's browser. Public exploit code exists for this vulnerability, which can be leveraged to modify HTTP server behavior and admin listener settings without user knowledge. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens are enforced.
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External POC / Exploit Code
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