CVE-2026-66061Public exploit

Silent automation execution via unapproved tag links

Published Aug 7, 2026 · Updated Aug 7, 2026

Missing authorization in Home Assistant Companion for iOS before 2026.5.0 allows local users to trigger tag-bound automations silently. iOSTagManager.handle(userActivity:) accepts attacker-chosen universal-link tag IDs and calls fireEvent(tag:) through the stored session without validating the caller or obtaining approval. A logged-in Companion app with a configured server is required; an unprivileged local app can issue integrity-affecting actions tied to guessed or known tags.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Home Assistant Companion for iOS before 2026.5.0 allows local users to trigger tag-bound automations silently. iOSTagManager.handle(userActivity:) accepts attacker-chosen universal-link tag IDs and calls fireEvent(tag:) through the stored session without validating the caller or obtaining approval. A logged-in Companion app with a configured server is required; an unprivileged local app can issue integrity-affecting actions tied to guessed or known tags.

The record

CVE
CVE-2026-66061
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
Home Assistant
Product
Home Assistant Core
Classifications
CWE-862
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 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=< 2026.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Coreversion=< 2026.5.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization

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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