CVE-2026-55584 EXPLOIT
7.5
HIGH · CVSS 3.1 · EPSS 1.9% (pctl 79)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 7.5 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 1.91% — more likely to be exploited than 79% of all CVEs |
| Weakness | CWE-290 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2026-08-28 |
| Last modified | 2026-09-09 |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | phpSysInfo 3.4.5 - IP Allowlist Bypass | 2026-08-17 |
References
→ the Explorer · watch your stack · NVD