CVE-2026-32136Public exploitNetwork attack vector

Unauthenticated administrative access via h2c upgrade

Published Mar 11, 2026 · Updated Mar 11, 2026

Authentication bypass in AdGuard Home before 0.107.73 allows remote attackers to access administrative APIs via an h2c upgrade. The h2c handler in internal/home/web.go passes upgraded connections to an inner mux that lacks the authentication middleware applied outside it. A request to a public path can therefore establish a credential-free HTTP/2 session that reads or changes DNS configuration and other administrative data.

CVSS severity9.8
Critical
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in AdGuard Home before 0.107.73 allows remote attackers to access administrative APIs via an h2c upgrade. The h2c handler in internal/home/web.go passes upgraded connections to an inner mux that lacks the authentication middleware applied outside it. A request to a public path can therefore establish a credential-free HTTP/2 session that reads or changes DNS configuration and other administrative data.

The record

CVE
CVE-2026-32136
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
AdGuard Software Limited
Product
AdGuard Home
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.107.73

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AdGuard Software Limited · AdGuard Homeversion=< 0.107.73

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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