User Impersonation Affecting phpsysinfo/phpsysinfo package, versions <3.4.6
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-PHPSYSINFOPHPSYSINFO-20186902
- published28 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-55584 (opens in a new tab)How to fix?
Upgrade phpsysinfo/phpsysinfo to version 3.4.6 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation via the read_config.php process. An attacker can gain unauthorized access to sensitive system information by sending spoofed X-Forwarded-For or Client-IP HTTP headers to impersonate a trusted IP address.