AdguardTeam AdGuardHome up to 0.107.72 improper authentication

Summaryinfo

A vulnerability classified as critical was found in AdguardTeam AdGuardHome up to 0.107.72. Impacted is an unknown function. Such manipulation leads to improper authentication. This vulnerability is referenced as CVE-2026-32136. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in AdguardTeam AdGuardHome up to 0.107.72. It has been rated as critical. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

AdGuard Home is a network-wide software for blocking ads and tracking. Prior to 0.107.73, an unauthenticated remote attacker can bypass all authentication in AdGuardHome by sending an HTTP/1.1 request that requests an upgrade to HTTP/2 cleartext (h2c). Once the upgrade is accepted, the resulting HTTP/2 connection is handled by the inner mux, which has no authentication middleware attached. All subsequent HTTP/2 requests on that connection are processed as fully authenticated, regardless of whether any credentials were provided. This vulnerability is fixed in 0.107.73.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-32136 since 03/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 0.107.73 eliminates this vulnerability.

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Productinfo

Vendor

• AdguardTeam

Name

• AdGuardHome

Version

• 0.107.0
• 0.107.1
• 0.107.2
• 0.107.3
• 0.107.4
• 0.107.5
• 0.107.6
• 0.107.7
• 0.107.8
• 0.107.9
• 0.107.10
• 0.107.11
• 0.107.12
• 0.107.13
• 0.107.14
• 0.107.15
• 0.107.16
• 0.107.17
• 0.107.18
• 0.107.19
• 0.107.20
• 0.107.21
• 0.107.22
• 0.107.23
• 0.107.24
• 0.107.25
• 0.107.26
• 0.107.27
• 0.107.28
• 0.107.29
• 0.107.30
• 0.107.31
• 0.107.32
• 0.107.33
• 0.107.34
• 0.107.35
• 0.107.36
• 0.107.37
• 0.107.38
• 0.107.39
• 0.107.40
• 0.107.41
• 0.107.42
• 0.107.43
• 0.107.44
• 0.107.45
• 0.107.46
• 0.107.47
• 0.107.48
• 0.107.49
• 0.107.50
• 0.107.51
• 0.107.52
• 0.107.53
• 0.107.54
• 0.107.55
• 0.107.56
• 0.107.57
• 0.107.58
• 0.107.59
• 0.107.60
• 0.107.61
• 0.107.62
• 0.107.63
• 0.107.64
• 0.107.65
• 0.107.66
• 0.107.67
• 0.107.68
• 0.107.69
• 0.107.70
• 0.107.71
• 0.107.72

Website

• Product: https://github.com/AdguardTeam/AdGuardHome/

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