CVE-2026-55844Public exploitNetwork attack vector

Access-token disclosure via unchecked internal-URL fallback

Published Jun 29, 2026 · Updated Jun 29, 2026

Cleartext transmission in Home Assistant Companion for iOS before 2025.5.0 allows man-in-the-middle attackers to steal access tokens. When no external URL is available, the connection-selection fallback uses the configured internal URL without enforcing its SSID allowlist, sending authentication and queued sensor data to any reachable endpoint. Exposure requires an HTTP internal URL and an untrusted network where an observer can sniff traffic or an attacker can impersonate the configured endpoint.

CVSS severity7.5
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in Home Assistant Companion for iOS before 2025.5.0 allows man-in-the-middle attackers to steal access tokens. When no external URL is available, the connection-selection fallback uses the configured internal URL without enforcing its SSID allowlist, sending authentication and queued sensor data to any reachable endpoint. Exposure requires an HTTP internal URL and an untrusted network where an observer can sniff traffic or an attacker can impersonate the configured endpoint.

The record

CVE
CVE-2026-55844
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Home Assistant
Product
Home Assistant for iOS
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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=< 2025.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant for iOSversion=< 2025.5.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

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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