SEPTEMBER 18, 2026
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Case File

CVE-2026-55584

HIGH · CVSS 7.5 EPSS 2.42% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

phpSysInfo versions prior to 3.4.6 are vulnerable due to an inadequate access-control check in read_config.php, allowing remote unauthenticated attackers to exploit manipulated X-Forwarded-For and Client-IP headers. This vulnerability enables attackers to impersonate trusted clients and gain unauthorized access to sensitive system information, including hostname, kernel, CPU, memory, filesystem, and network-interface details. Organizations using affected versions should prioritize upgrading to version 3.4.6 to mitigate the risk of information disclosure.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55584
Severity
HIGH
CVSS
7.5
EPSS
2.42%

Original NVD Description

phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6.