CVE Catalog

CVE-2026-55584

HighCVSS 7.5
Published: Translated: NVD NIST

Exploitation Probability (EPSS)

High risk
2.42%

83th percentile - higher than 83% of all known CVEs

Summary

phpSysInfo prior to 3.4.6 contains a vulnerability in the PSI_ALLOWED access-control check in read_config.php, which 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.

Risk Assessment

The risk to the organization is unauthorized access to sensitive system information, which may facilitate further attacks or breach confidentiality.

Recommendation

Update phpSysInfo to version 3.4.6 or later and configure the server to ignore X-Forwarded-For and Client-IP headers if not required.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS