CVE-2026-92700: Caddy: fileHidden() case-sensitive pattern bypass — exposes "hidden" files via case variation

Severity: medium (CVSS 6.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-23 · updated 2026-09-30
Weakness: CWE-178

Description

Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, in modules/caddyhttp/fileserver/staticfiles.go, fileHidden() uses case-sensitive filepath.Match checks, so case variants can bypass hide rules on case-insensitive filesystems or when mixed-case paths coexist and expose files intended to be hidden.

Affected products

caddyserver caddy: through 2.11.3

References

https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9
https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9

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