Vulnerability Details CVE-2026-27589
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.7%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-27589
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cpe:2.3:a:caddyserver:caddy:0.10.0
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cpe:2.3:a:caddyserver:caddy:0.10.1
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cpe:2.3:a:caddyserver:caddy:0.10.10
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cpe:2.3:a:caddyserver:caddy:0.10.11
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cpe:2.3:a:caddyserver:caddy:0.10.12
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cpe:2.3:a:caddyserver:caddy:0.10.13
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cpe:2.3:a:caddyserver:caddy:0.10.14
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cpe:2.3:a:caddyserver:caddy:0.10.2
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cpe:2.3:a:caddyserver:caddy:0.10.3
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cpe:2.3:a:caddyserver:caddy:0.10.4
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cpe:2.3:a:caddyserver:caddy:0.10.5
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cpe:2.3:a:caddyserver:caddy:0.10.6
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cpe:2.3:a:caddyserver:caddy:0.10.7
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cpe:2.3:a:caddyserver:caddy:0.10.8
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cpe:2.3:a:caddyserver:caddy:0.10.9
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cpe:2.3:a:caddyserver:caddy:0.11.0
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cpe:2.3:a:caddyserver:caddy:0.11.1
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cpe:2.3:a:caddyserver:caddy:0.5.0
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cpe:2.3:a:caddyserver:caddy:0.5.1
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cpe:2.3:a:caddyserver:caddy:0.6.0
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cpe:2.3:a:caddyserver:caddy:0.7.0
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cpe:2.3:a:caddyserver:caddy:0.7.1
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cpe:2.3:a:caddyserver:caddy:0.7.2
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cpe:2.3:a:caddyserver:caddy:0.7.3
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cpe:2.3:a:caddyserver:caddy:0.7.4
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cpe:2.3:a:caddyserver:caddy:0.7.5
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cpe:2.3:a:caddyserver:caddy:0.7.6
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cpe:2.3:a:caddyserver:caddy:0.8.0
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cpe:2.3:a:caddyserver:caddy:0.8.1
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cpe:2.3:a:caddyserver:caddy:0.8.2
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cpe:2.3:a:caddyserver:caddy:0.8.3
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cpe:2.3:a:caddyserver:caddy:0.9.0
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cpe:2.3:a:caddyserver:caddy:0.9.1
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cpe:2.3:a:caddyserver:caddy:0.9.2
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cpe:2.3:a:caddyserver:caddy:0.9.3
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cpe:2.3:a:caddyserver:caddy:0.9.4
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cpe:2.3:a:caddyserver:caddy:0.9.5
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cpe:2.3:a:caddyserver:caddy:1.0.0
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cpe:2.3:a:caddyserver:caddy:1.0.1
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cpe:2.3:a:caddyserver:caddy:1.0.2
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cpe:2.3:a:caddyserver:caddy:1.0.3
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cpe:2.3:a:caddyserver:caddy:1.0.4
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cpe:2.3:a:caddyserver:caddy:1.0.5
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cpe:2.3:a:caddyserver:caddy:2.0.0
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cpe:2.3:a:caddyserver:caddy:2.1.0
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cpe:2.3:a:caddyserver:caddy:2.1.1
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cpe:2.3:a:caddyserver:caddy:2.10.0
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cpe:2.3:a:caddyserver:caddy:2.10.1
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cpe:2.3:a:caddyserver:caddy:2.10.2
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cpe:2.3:a:caddyserver:caddy:2.11.0
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cpe:2.3:a:caddyserver:caddy:2.2.0
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cpe:2.3:a:caddyserver:caddy:2.2.1
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cpe:2.3:a:caddyserver:caddy:2.2.3
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cpe:2.3:a:caddyserver:caddy:2.3.0
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cpe:2.3:a:caddyserver:caddy:2.4.0
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cpe:2.3:a:caddyserver:caddy:2.4.1
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cpe:2.3:a:caddyserver:caddy:2.4.2
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cpe:2.3:a:caddyserver:caddy:2.4.3
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cpe:2.3:a:caddyserver:caddy:2.4.4
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cpe:2.3:a:caddyserver:caddy:2.4.5
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cpe:2.3:a:caddyserver:caddy:2.4.6
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cpe:2.3:a:caddyserver:caddy:2.5.0
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cpe:2.3:a:caddyserver:caddy:2.5.1
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cpe:2.3:a:caddyserver:caddy:2.5.2
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cpe:2.3:a:caddyserver:caddy:2.6.0
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cpe:2.3:a:caddyserver:caddy:2.6.1
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cpe:2.3:a:caddyserver:caddy:2.6.2
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cpe:2.3:a:caddyserver:caddy:2.6.3
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cpe:2.3:a:caddyserver:caddy:2.6.4
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cpe:2.3:a:caddyserver:caddy:2.7.0
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cpe:2.3:a:caddyserver:caddy:2.7.1
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cpe:2.3:a:caddyserver:caddy:2.7.2
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cpe:2.3:a:caddyserver:caddy:2.7.3
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cpe:2.3:a:caddyserver:caddy:2.7.4
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cpe:2.3:a:caddyserver:caddy:2.7.5
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cpe:2.3:a:caddyserver:caddy:2.7.6
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cpe:2.3:a:caddyserver:caddy:2.8.0
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cpe:2.3:a:caddyserver:caddy:2.8.1
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cpe:2.3:a:caddyserver:caddy:2.8.2
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cpe:2.3:a:caddyserver:caddy:2.8.3
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cpe:2.3:a:caddyserver:caddy:2.8.4
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cpe:2.3:a:caddyserver:caddy:2.9.0
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cpe:2.3:a:caddyserver:caddy:2.9.1