Vulnerability · Published Jun 8, 2026 · Assigned by VulnCheck

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

Critical 9.4

In plain English

A critical-severity path traversal in AdGuardHome from AdguardTeam. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)9.4Critical

Exploit odds (30 days)0.5%top 54.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
AdguardTeam	AdGuardHome	0 – before 0.107.77

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

References

https://github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77 release-notes
https://www.vulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traversal-in-admin-token-cookie third-party-advisory