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CVE-2026-27587 - Vulnerability Analysis

CriticalCVSS: 9.1

Last Updated: February 25, 2026

Caddy - Broken Access Control

Published: February 24, 2026Updated: February 25, 2026PoC AvailableRemote Exploitable

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

Severity: Critical

CVSS Score: 9.1

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

Related Resources

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Details

CVE ID: CVE-2026-27587
Severity: Critical
CVSS Score: 9.1
Type: broken_access_control
Status: confirmed

CWE

CWE-178

CVSS Metrics

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