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High · 7.5 Public exploit CVE-2026-55584 EUVD-2026-67862GHSA-786w-p5pm-cvgh

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

Published Aug 28, 2026 · Updated Aug 31, 2026 · Assigned by GitHub_M

Vendor: phpsysinfo Product: phpsysinfo Package: phpsysinfo Package: phpsysinfo Package: phpsysinfo/phpsysinfo Ecosystem: Debian Ecosystem: Packagist Ecosystem: Ubuntu

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

VendorProductAffectedFixed
phpsysinfo phpsysinfo < 3.4.6 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 phpsysinfo No fix yet —
Debian 13 phpsysinfo No fix yet —
Debian 12 phpsysinfo No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 phpsysinfo No fix yet —
Ubuntu 26.04 LTS phpsysinfo No fix yet —
Ubuntu 24.04 LTS phpsysinfo No fix yet —
Ubuntu 22.04 LTS phpsysinfo No fix yet —
Ubuntu 20.04 LTS phpsysinfo No fix yet —
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS phpsysinfo No fix yet —
Ubuntu 16.04 LTS phpsysinfo No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Exploit-DB 1

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist phpsysinfo/phpsysinfo < 3.4.6 3.4.6 GHSA-786w-p5pm-cvgh

References