Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc
- https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6
- https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh
FAQ
What is CVE-2026-55584?
CVE-2026-55584 is a vulnerability with a CVSS score of 7.5 (HIGH). 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-...
How severe is CVE-2026-55584?
CVE-2026-55584 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55584?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.