CVE-2026-27587 - Vulnerability Analysis

Overview

Caddy < 2.11.1 contains a broken access control caused by case-sensitive comparison of percent-escaped sequences in HTTP path matcher, letting attackers bypass path-based routing and access controls, exploit requires crafted request with altered casing.

Severity & Score

Impact

Attackers can bypass path-based routing and access controls, potentially accessing unauthorized resources.

Mitigation

Upgrade to version 2.11.1 or later.

References

• https://github.com/caddyserver/caddy/releases/tag/v2.11.1
• https://github.com/caddyserver/caddy/security/advisories/GHSA-g7pc-pc7g-h8jh

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Feb 25, 2026

🔴 CVE-2026-27587 - Critical (9.1) Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `path` request matcher is intended to be case-insensitive, but when the match pattern contains percent-escape sequences (`%xx`) it compares agai... 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-27587/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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