Vulnerability Details CVE-2026-30851
Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 5.2%
CVSS Severity
CVSS v3 Score 8.1
References
Products affected by CVE-2026-30851
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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:2.11.1