CVE-2026-27589
Caddy is an extensible server platform that uses TLS by default.
Published Feb 24, 2026 · updated Jun 17, 2026 · caddyserver caddy
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen ) exposes a state-changing endpoint that replaces the entire running configuration. When origin enforcement is not enabled ( 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.
Code
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Timeline
Detection, updates, and resolution for this record.
Feb 24, 2026 · NIST NVD
Detected
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen ) exposes a state-changing endpoint that replaces the entire running configuration. When origin enforcement is not enabled ( not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies
Jun 17, 2026 · NIST NVD
Updated
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen ) exposes a state-changing endpoint that replaces the entire running configuration. When origin enforcement is not enabled ( not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies
Affected
- cpe caddyserver/caddyversion unspecified
Sources
- NIST NVDVulnerability recordCVE-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 ) exposes a state-changing endpoint that replaces the entire running configuration. When origin enforcement is not enab
nvd.nist.gov