{"id":"UBUNTU-CVE-2026-55584","details":"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.","modified":"2026-09-02T16:20:01Z","published":"2026-08-28T20:18:00Z","upstream":["CVE-2026-55584"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-55584"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-55584"},{"type":"REPORT","url":"https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh"},{"type":"REPORT","url":"https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab"},{"type":"REPORT","url":"https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab"},{"type":"REPORT","url":"https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6"}],"affected":[{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.17-1ubuntu1","3.2.1-1ubuntu1","3.2.1-1ubuntu2","3.2.1-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"phpsysinfo","binary_version":"3.2.1-1ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}},{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.5-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.2.5-3ubuntu1","binary_name":"phpsysinfo"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}},{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.5-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpsysinfo","binary_version":"3.2.5-3ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}},{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.5-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpsysinfo","binary_version":"3.2.5-3ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}},{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.3-1","3.4.3-3"],"ecosystem_specific":{"binaries":[{"binary_name":"phpsysinfo","binary_version":"3.4.3-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}},{"package":{"name":"phpsysinfo","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/phpsysinfo?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpsysinfo","binary_version":"3.4.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55584.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}