CVE-2026-27589 – Caddy vulnerable to cross-origin config application via local admin API /load (caddy)

CVE ID : CVE-2026-27589

Published : Feb. 24, 2026, 4:30 p.m. | 35 minutes ago

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.

Severity: 0.0 | NA

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