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VulnerabilityPublished

CVE-2026-32136: AdguardTeam AdGuardHome · Improper Authentication

Affects AdguardTeam AdGuardHomeSource CVE Database V5

0
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Not known to be exploited · CVSS 9.8 Critical : upgrade to 0.107.73 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.107.73
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade AdGuardHome and adguardteam/AdGuardHome to 0.107.73.

Affected software

ProductAffectedFixed in
AdguardTeamAdGuardHomeAffected
  • <0.107.73
Fixed in
  • 0.107.73
GitHubadguardteam/AdGuardHomepkg:github/adguardteam/AdGuardHomeOther threatsAffected
  • <0.107.73
Fixed in
  • 0.107.73

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate this vulnerability, organizations should immediately upgrade all AdGuard Home instances to version 0.107.73 or later, where the authentication bypass is fixed. Until upgrades can be applied, restrict network access to AdGuard Home's management interfaces using firewall rules or network segmentation to allow only trusted administrators. Disable HTTP/2 cleartext (h2c) upgrade requests if configurable, or deploy reverse proxies that enforce authentication before forwarding requests to AdGuard Home. Monitor network traffic for unusual HTTP/2 upgrade attempts and unauthorized administrative actions. Regularly audit and review DNS filtering configurations for unauthorized changes. Implement strong network perimeter defenses and intrusion detection systems to detect and block exploitation attempts. Maintain up-to-date backups of configuration data to enable recovery in case of compromise.

Description

CVE-2026-32136 is a critical authentication bypass vulnerability in AdGuard Home versions prior to 0.107.73. An unauthenticated remote attacker can exploit this flaw by sending an HTTP/1.1 request that upgrades the connection to HTTP/2 cleartext (h2c). The upgraded HTTP/2 connection bypasses the authentication middleware, allowing the attacker to perform any actions as if fully authenticated. This vulnerability affects confidentiality, integrity, and availability of the affected systems. The flaw is fixed in version 0.107.73.

References

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