What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-22

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

• AdguardTeam AdGuardHome: before 0.107.77 — fixed in 0.107.77

How to fix

Upgrade to a fixed version: AdguardTeam AdGuardHome 0.107.77. Check the vendor advisory for mitigations.

References

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

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