SB20260424161 - Improper Authentication in AdGuard Home
Published: April 24, 2026 Updated: April 30, 2026
Security Bulletin ID
SB20260424161
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Authentication (CVE-ID: CVE-2026-32136)
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: 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
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.
Remediation
Install update from vendor's website.