CVE-2026-41448 CRITICAL

CVE-2026-41448: AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie

Vendor Adguardteam
Product AdGuardHome
Weakness CWE-22 · Path traversal
Published June 8, 2026
Last update June 8, 2026

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 8, 2026 CVE published
June 8, 2026 Record updated