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CVE-2026-44698

Home Assistant is open source home automation software that puts local control and privacy first. Prior to 2026.4.1 for iOS and 2026.4.4 for Android, he Home Assistant Companion apps for Android and iOS expose a JavaScript bridge to the in-app WebView window.externalApp on Android and webkit.messageHandlers.getExternalAuth (alongside revokeExternalAuth and externalBus) on iOS. Two flaws expose the bridge to all frames (including cross-origin iframes) and unsanitized interpolation of the JavaScri
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fd78ed37b20009a52f957df10b3b8da1d27c662ed7db602f30ea1b2f4d04df2f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 3 assertions

{"product":"Companion app (iOS)","vendor":"Home Assistant","versions":[{"status":"affected","version":"< 2026.4.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/1

{"product":"core","vendor":"home-assistant","versions":[{"status":"affected","version":"< 2026.4.4"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/0

{"product":"Companion app (Android)","vendor":"Home Assistant","versions":[{"status":"affected","version":"< 2026.4.4"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/2
cwe · 4 assertions

{"cweId":"CWE-749","description":"CWE-749: Exposed Dangerous Method or Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-940","description":"CWE-940: Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/3/descriptions/0

Affected products and versions

3 source assertions
{"product":"Companion app (iOS)","vendor":"Home Assistant","versions":[{"status":"affected","version":"< 2026.4.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/1
{"product":"core","vendor":"home-assistant","versions":[{"status":"affected","version":"< 2026.4.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/0
{"product":"Companion app (Android)","vendor":"Home Assistant","versions":[{"status":"affected","version":"< 2026.4.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/affected/2

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

4 source assertions
{"cweId":"CWE-749","description":"CWE-749: Exposed Dangerous Method or Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-940","description":"CWE-940: Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/problemTypes/3/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/home-assistant/core/security/advisories/GHSA-7jp2-p2fw-mgvf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bea34d22ce3d0cf87a79aad65ca16ec4c5d5abd98d24af4fc812d19c4ae2cefc · sha256:70bfc635a9563fd8… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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