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Vulnerability record · CVE-2026-52844 · published 23 June 2026

CVE-2026-52844: Caddyserver caddy path traversal vulnerability

Caddyserver · Caddy

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.

7.5 CVSS 3.1 High EPSS 0.62% · top 52.4% CWE-22 · Path traversalCWE-284 · Improper access control
7.5CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
29 Jun 2026Last modified by NVD

Description

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/caddyserver/caddy/security/advisories/GHSA-qrp7-cvwr-j2c6 Third Party AdvisoryExploit
https://github.com/caddyserver/caddy/security/advisories/GHSA-qrp7-cvwr-j2c6 Third Party AdvisoryExploit

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-52844), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.