---
id: CVE-2026-55584
title: phpSysInfo is a customizable PHP script that displays system information
summary: >-
  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…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-290
vendor: phpsysinfo
product: phpsysinfo/phpsysinfo
affected:
  - phpsysinfo/phpsysinfo <= 3.4.5
patched:
  - phpsysinfo/phpsysinfo 3.4.6
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55584'
references:
  - url: >-
      https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab
    label: security-advisories@github.com
  - url: 'https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-786w-p5pm-cvgh'
tags:
  - nvd
  - exploit-available
  - ghsa
  - composer
epss: 0.0191
epssPercentile: 0.7896
exploits:
  exploitdb: true
  github: 1
  githubRepos:
    - 'https://github.com/mirackayikci/CVE-2026-55584'
  checkedAt: '2026-09-27T10:33:51.871Z'
exploitAvailable: true
aliases:
  - GHSA-786w-p5pm-cvgh
ecosystem: composer
ingestedAt: '2026-08-28T19:24:19.489Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55584)

Affected packages:

- `phpsysinfo/phpsysinfo <= 3.4.5`

Patched in:

- `phpsysinfo/phpsysinfo 3.4.6`

Source: https://github.com/advisories/GHSA-786w-p5pm-cvgh