{"schemaVersion":3,"id":"CVE-2026-55584","aliases":["UBUNTU-CVE-2026-55584","DEBIAN-CVE-2026-55584"],"status":"published","duplicateOf":null,"title":null,"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. 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