CVE-2026-27589
Description
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.
How to fix
- caddyserver caddy2.11.1 or later
- github.com/caddyserver/caddy/v22.11.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| caddyserver caddy | v < 2.11.1 | 2.11.1 |
| github.com/caddyserver/caddy/v2Go | v < 2.11.1 | 2.11.1 |
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