Improper Authentication in AdGuard Home - CVE-2026-32136
Published: April 24, 2026 / Updated: April 30, 2026
Vulnerability identifier: #VU127584
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2026-32136
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: AdGuard
Affected software:
AdGuard Home
AdGuard Home
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication and gain administrative access.
The vulnerability exists due to improper authentication in internal/home/web.go when processing an HTTP/1.1 request that upgrades to HTTP/2 cleartext (h2c). A remote attacker can send a specially crafted upgrade request to bypass authentication and gain administrative access.
HTTP/2 over TLS is not affected.
How to mitigate CVE-2026-32136
Install security update from vendor's website.