TI-2026-24673 Aliases CVE-2026-32136 GHSA-5fg6-wrq4-w5gh

AdGuard Home: HTTP/2 Cleartext (h2c) Upgrade Authentication Bypass

HIGH 82CWE-287Published 2026-03-11 · Updated 2026-03-12

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00836 57th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed AdGuardHome (AdguardTeam): 0.107.73github.com/AdguardTeam/AdGuardHome (Go): 0.107.73

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AdguardTeam	AdGuardHome	before 0.107.73	0.107.73	Patch available	CNA
—	github.com/AdguardTeam/AdGuardHome (Go)	before 0.107.73	0.107.73	Patch available	GHSA-5fg6-wrq4-w5gh

AdGuardHome VendorAdguardTeam Affected before 0.107.73 Fixed in 0.107.73 Patch available CNA
github.com/AdguardTeam/AdGuardHome (Go) Vendor— Affected before 0.107.73 Fixed in 0.107.73 Patch available GHSA-5fg6-wrq4-w5gh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:adguard:adguardhome::::::::	before 0.107.73	Vulnerable	Adguard

cpe:2.3:a:adguard:adguardhome:*:*:*:*:*:*:*:* Versions before 0.107.73 Vulnerable ·Adguard

Remediation

Fix · CNA AdGuardHome (AdguardTeam) Fixed in 0.107.73
Fix · GHSA-5fg6-wrq4-w5gh github.com/AdguardTeam/AdGuardHome (Go) Fixed in 0.107.73 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-32136
2026-10-03 Alias added: GHSA-5fg6-wrq4-w5gh

References

TI-2026-30037 AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie CVSS 4.0CRITICAL 9.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences