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

9.2CRITICAL

Key Information:

Vendor

Adguardteam

Status
Adguardhome
Vendor
CVE Published:
8 June 2026

What is CVE-2026-41448?

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 Version(s)

AdGuardHome 0

References

https://github.com/AdguardTeam/AdGuardHome/releases/tag/v...
release-notes
https://www.vulncheck.com/advisories/adguard-home-authent...
third-party-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

djnn
VulnCheck
.