CVE-2026-103592 PUBLISHED

simple-php-router through 5.4.1.7 contains an IP restriction bypass vulnerability in the IpRestrictAccess middleware that allows remote unauthenticated attackers to bypass IP whitelist and blacklist protections. Attackers can spoof X-Forwarded-For, CF-Connecting-IP, or Client-IP headers to impersonate whitelisted addresses or evade blacklists, gaining access to IP-restricted routes.

• Ikram-4 finder

• GitHub Issue #727
• https://github.com/skipperbent/simple-php-router/blob/5.4.1.7/src/Pecee/Http/Middleware/IpRestrictAccess.php
• https://github.com/skipperbent/simple-php-router/blob/5.4.1.7/src/Pecee/Http/Request.php
• https://github.com/skipperbent/simple-php-router
• VulnCheck Advisory: simple-php-router through 5.4.1.7 IP restriction bypass via forwarding headers

• Use of Less Trusted Source CWE