CVE-2026-41448
CriticalCVSS 9.4Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
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.
Risk Assessment
An unauthenticated attacker can gain full administrative access to AdGuard Home, allowing modification of DNS filtering configuration and potential traffic redirection.
Recommendation
Update AdGuard Home to a version that fixes this vulnerability. If an update is not available, do not use the --glinet flag.
Original NVD description (English source)
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.