Critical · CVSS 9.2CVE-2026-41448

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

Answer in brief

CVE-2026-41448 records a Critical severity (CVSS 9.2) vulnerability in AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie. The current sources do not mark it as known exploited. The current feed maps AdguardTeam/AdGuardHome (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AdguardTeam/AdGuardHome (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
AdguardTeam/AdGuardHomegeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for AdguardTeam/AdGuardHome.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 8, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.