# CVE-2026-55584

## Summary

- **CVE ID:** CVE-2026-55584
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
- **CWE:** CWE-290
- **Published:** Aug 28, 2026
- **Last Modified:** Aug 31, 2026

## 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.

## Affected Products

- phpsysinfo — phpsysinfo (< 3.4.6)

## References

- [CNA](https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh)
- [CNA](https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab)
- [CNA](https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 2.42%
- **EPSS Percentile:** 83.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._