CVE-2026-41448
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAdGuard 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceAdGuard Home with the --glinet flag enabled contains a path traversal vulnerability in the authglinet middleware that allows unauthenticated attackers to bypass authentication by supplying traversal sequences (e.g., ../../) in the Admin-Token cookie or header. The unsanitized string concatenation in token file path construction enables reading arbitrary files and gaining full admin access.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if AdGuard Home uses the --glinet flagRun 'ps aux | grep -i adguard' or check your startup/service configuration for the --glinet argument in the command lineAffected if The --glinet flag is present in the running process arguments or service definition
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Locate the AdGuard Home process command lineInspect /proc/<pid>/cmdline for the AdGuard process or review systemd/service startup scripts for --glinet usageAffected if The argument list contains '--glinet' or '--glinet=true'
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Verify the authglinet middleware is activeCheck AdGuard Home configuration files (usually in /etc/adguardhome.yaml or similar) for glinet-related settings or authentication middleware configurationAffected if The configuration shows glinet authentication is enabled or configured
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Review Admin-Token handling in the serviceExamine network exposure - determine if the AdGuard Home admin interface is accessible from untrusted networks when --glinet is in useAffected if The admin interface is reachable without additional access controls while --glinet mode is active
You are affected if AdGuard Home is running with the --glinet flag enabled, as this activates the vulnerable authglinet middleware that allows path traversal in token file paths.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDisable or remove the --glinet flag functionality if not required; otherwise, implement strict input validation and sanitization on the Admin-Token parameter to block path traversal sequences before constructing file paths.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-41448 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-41448 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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