CVE-2026-41448

Critical

Description

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.

SeverityCritical

CVSS9.4

Exploit probability—

ProductAdGuardHome

PublishedJun 8, 2026

First seenJun 8, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

AdguardTeam AdGuardHome0.107.77 or later

Vendor advisories

github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77

Affected products

Product	Affected versions	Fixed in
AdguardTeam AdGuardHome	v < 0.107.77	0.107.77

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