TI-2026-40123 Aliases CVE-2026-55584 GHSA-786w-p5pm-cvgh

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

MEDIUM 43CWE-290Published 2026-08-28 · Updated 2026-08-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0191 79th percentileScored 2026-11-07

Fix Fixed phpsysinfo (phpsysinfo): 3.4.6phpsysinfo/phpsysinfo (Packagist): 3.4.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
phpsysinfo	phpsysinfo	before 3.4.6	3.4.6	Patch available	CNA
—	phpsysinfo/phpsysinfo (Packagist)	before 3.4.6	3.4.6	Patch available	GHSA-786w-p5pm-cvgh

phpsysinfo Vendorphpsysinfo Affected before 3.4.6 Fixed in 3.4.6 Patch available CNA
phpsysinfo/phpsysinfo (Packagist) Vendor— Affected before 3.4.6 Fixed in 3.4.6 Patch available GHSA-786w-p5pm-cvgh

Remediation

Fix · CNA phpsysinfo (phpsysinfo) Fixed in 3.4.6
Fix · GHSA-786w-p5pm-cvgh phpsysinfo/phpsysinfo (Packagist) Fixed in 3.4.6 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55584
2026-10-03 Alias added: GHSA-786w-p5pm-cvgh

References

Other 4

TI-2006-03258 Directory traversal vulnerability in index.php in phpSysInfo 2.5.1 allows remote… CVSS 2.0MEDIUM 5.0
TI-2005-00812 phpSysInfo 2.3 allows remote attackers to obtain sensitive information via a direct… CVSS 2.0MEDIUM 5.0
TI-2023-26715 Cross Site Request Forgery (CSRF) vulnerability in Phpsysinfo version 3.4.3 allows a… CVSS 3.1MEDIUM 6.5
TI-2005-00813 Multiple cross-site scripting (XSS) vulnerabilities in phpSysInfo 2.3, when… CVSS 2.0MEDIUM 4.3
TI-2005-03173 HTTP response splitting vulnerability in index.php in phpSysInfo 2.4 and earlier, as used… CVSS 2.0MEDIUM 4.3
TI-2007-03917 Cross-site scripting (XSS) vulnerability in index.php in phpSysInfo 2.5.4-dev and earlier… CVSS 2.0MEDIUM 4.3

See all 7 →

Sources

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