{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-41448: AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-41448","status":"final","version":"1","initial_release_date":"2026-06-08T16:12:56.518Z","current_release_date":"2026-06-08T17:55:39.024Z","revision_history":[{"date":"2026-06-08T16:12:56.518Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"AdGuard Home, when started with the --glinet flag, contains an authentication bypass vulnerability that allows unauthenticated attackers to gain full admin access by supplying a path traversal sequence in the Admin-Token cookie, exploiting unsanitized string concatenation in the token file path construction within the authglinet middleware. Attackers can craft a request with a traversal payload in the Admin-Token header to redirect file reads to arbitrary paths.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-41448 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-41448"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-41448"},{"category":"external","summary":"github.com","url":"https://github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77"},{"category":"external","summary":"vulncheck.com","url":"https://www.vulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traversal-in-admin-token-cookie"}]},"product_tree":{"branches":[{"category":"vendor","name":"AdguardTeam","branches":[{"category":"product_name","name":"AdGuardHome","branches":[{"category":"product_version_range","name":"<0.107.77","product":{"name":"AdguardTeam AdGuardHome <0.107.77","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:adguardteam:adguardhome:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-41448","title":"AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie","notes":[{"category":"description","text":"AdGuard Home, when started with the --glinet flag, contains an authentication bypass vulnerability that allows unauthenticated attackers to gain full admin access by supplying a path traversal sequence in the Admin-Token cookie, exploiting unsanitized string concatenation in the token file path construction within the authglinet middleware. Attackers can craft a request with a traversal payload in the Admin-Token header to redirect file reads to arbitrary paths.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","baseScore":9.2,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0.107.77.","product_ids":["CSAFPID-1"]}]}]}