{"id":"UBUNTU-CVE-2026-34959","details":"Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER[\"REQUEST_URI\"] with no trusted-proxy check and no validation of the prefix value. An attacker can supply an absolute URL (e.g. X-Forwarded-Prefix: https://evil.example) that flows into Location redirect headers, the Set-Cookie path attribute, and self-referential links. This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible.","modified":"2026-09-02T19:35:43.691113565Z","published":"2026-08-25T02:16:00Z","upstream":["CVE-2026-34959"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34959"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34959"},{"type":"REPORT","url":"https://github.com/vrana/adminer/security/advisories/GHSA-8478-xrj3-h9c2"}],"affected":[{"package":{"name":"adminer","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-1","4.2.1-1ubuntu1","4.2.1-1ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.2.1-1ubuntu1+esm1","binary_name":"adminer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}},{"package":{"name":"adminer","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1-2","4.5.0-1","4.6.1-1","4.6.2-1","4.6.2-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"adminer","binary_version":"4.6.2-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}},{"package":{"name":"adminer","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.2-1","4.7.4-1","4.7.5-1","4.7.6-1","4.7.6-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.7.6-1ubuntu0.1~esm1","binary_name":"adminer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}},{"package":{"name":"adminer","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.9-2","4.8.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"adminer","binary_version":"4.8.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}},{"package":{"name":"adminer","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.1-1","4.8.1-1ubuntu1","4.8.1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"adminer","binary_version":"4.8.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}},{"package":{"name":"adminer","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/adminer?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.1+dfsg-1","5.3.0+dfsg-1","5.4.0+dfsg-1","5.4.1+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"adminer","binary_version":"5.4.1+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34959.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"},{"type":"Ubuntu","score":"medium"}]}