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phpSysInfo 3.4.5 - IP Allowlist BypassCVE-2026-55584
0

phpSysInfo version 3.4.5 and earlier contains an IP allowlist bypass vulnerability. The application determines the client IP address by first checking the X-Forwarded-For and Client-IP HTTP headers, which can be attacker-controlled, before falling back to the more trustworthy REMOTE_ADDR. Because there is no trusted-proxy configuration, an attacker can spoof an allowed IP address via these headers and bypass the IP allowlist restriction to access sensitive system information exposed through xml.php. This vulnerability is fixed in version 3.4.6 by restricting the use of these headers to requests from trusted proxies only.

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