{"id":"CVE-2020-35591","details":"Pi-hole 5.0, 5.1, and 5.1.1 allows Session Fixation. The application does not generate a new session cookie after the user is logged in. A malicious user is able to create a new session cookie value and inject it to a victim. After the victim logs in, the injected cookie becomes valid, giving the attacker access to the user's account through the active session.","modified":"2026-08-27T08:15:06.996069Z","published":"2021-02-18T20:15:12.290Z","references":[{"type":"ADVISORY","url":"https://discourse.pi-hole.net/c/announcements/5"},{"type":"EVIDENCE","url":"https://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pi-hole/pi-hole","events":[{"introduced":"4d25f695267590b61a4061f9bb43448005d99b85"},{"last_affected":"56cd7c4d59ceb629a2170cd1c8ab78ef26366019"}],"database_specific":{"cpe":["cpe:2.3:a:pi-hole:pi-hole:5.0:*:*:*:*:*:*:*","cpe:2.3:a:pi-hole:pi-hole:5.1:*:*:*:*:*:*:*","cpe:2.3:a:pi-hole:pi-hole:5.1.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"5.0"},{"last_affected":"5.0"},{"introduced":"5.1"},{"last_affected":"5.1"},{"introduced":"5.1.1"},{"last_affected":"5.1.1"}],"source":"CPE_STRING"}}],"versions":["5.0","5.1","5.1.1","v5.1.1","v5.1","v5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35591.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/pi-hole/web","events":[{"introduced":"b86e4a3178e46cef9fc738c6a0fb8d0ef0ff2fbc"},{"last_affected":"a03d1bddf74f0164f637126b06705bb659dfa4e7"}],"database_specific":{"cpe":["cpe:2.3:a:pi-hole:pi-hole:5.0:*:*:*:*:*:*:*","cpe:2.3:a:pi-hole:pi-hole:5.1:*:*:*:*:*:*:*","cpe:2.3:a:pi-hole:pi-hole:5.1.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"5.0"},{"last_affected":"5.0"},{"introduced":"5.1"},{"last_affected":"5.1"},{"introduced":"5.1.1"},{"last_affected":"5.1.1"}],"source":"CPE_STRING"}}],"versions":["5.0","5.1","5.1.1","v5.1.1","v5.1","v5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35591.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"}]}