CVE-2024-21496: Authcrunch Caddy-Security

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

All versions of the package github.com/greenpau/caddy-security are vulnerable to Cross-site Scripting (XSS) via the Referer header, due to improper input sanitization. Although the Referer header is sanitized by escaping some characters that can allow XSS (e.g., [&], [<], [>], ["], [']), it does not account for the attack based on the JavaScript URL scheme (e.g., javascript:alert(document.domain)// payload). Exploiting this vulnerability may not be trivial, but it could lead to the execution of malicious scripts in the context of the target user’s browser, compromising user sessions.

Affected products

• Authcrunch Caddy-Security: affected versions not specified

Published 2024-02-17. Last modified 2026-06-17.