Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

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

Medium 6.3

In plain English

A medium-severity security flaw in caddy from caddyserver. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.4%top 64.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	caddy	no fix listed	DEBIAN-CVE-2026-92700
Debian:13	caddy	no fix listed	DEBIAN-CVE-2026-92700
Debian:14	caddy	no fix listed	DEBIAN-CVE-2026-92700
Go	github.com/caddyserver/caddy/v2	2.11.4	GHSA-j8px-rmrx-76h9
Go	github.com/caddyserver/caddy/v2	2.11.4	GO-2026-6512
Ubuntu:26.10	caddy	no fix listed	UBUNTU-CVE-2026-92700

Affected products (as reported)

Vendor	Product	Versions
caddyserver	caddy	<= 2.11.3

Weakness: CWE-178 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

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