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CVE-2026-55584— phpSysInfo: IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers

Quick assessment

Affected
phpsysinfo phpsysinfo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

phpSysInfo 是一个可定制化的 PHP 脚本，用于显示系统信息。在 3.4.6 版本之前， 中的 访问控制检查在处理 之前，会优先信任由攻击者控制的 和 HTTP 请求头。未经认证的远程攻击者可以通过在这两个请求头中填入允许访问的 IP 地址，伪装成受信任的客户端，从而获取暴露的主机名、内核、CPU、内存、文件系统及网络接口等信息。该问题已在 3.4.6 版本中修复。

CVSS 7.5 · High

Public Exploits 1

ExploitDB · 1 EDB-52648 [remote]

Affected Version Matrix 1

VendorProduct Version RangeStatus
phpsysinfo phpsysinfo < 3.4.6 affected
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I. Basic Information for CVE-2026-55584

Vulnerability Information
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Vulnerability Title
phpSysInfo: IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
phpsysinfo phpsysinfo < 3.4.6 -

II. Public POCs for CVE-2026-55584

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III. Intelligence Information for CVE-2026-55584

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Patches & Fixes for CVE-2026-55584 (1)

Vendor Advisories for CVE-2026-55584 (1)

Vendor Pages for CVE-2026-55584 (1)

IV. Related Vulnerabilities

Same weakness: CWE-290

V. Comments for CVE-2026-55584

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