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CVE-2026-64823

Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's async_get_media_image() method that allows attackers controlling a Shelly device's thumb field to serve arbitrary HTML content by supplying a data URI with a text/html content type without validation against an image-only allowlist. Attackers can cause the media player proxy endpoint to serve attacker-controlled bytes with Content-Type text/html in the Home Assistant web origin, enabling
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:cd68df7ec4ddcad3ff117152e595262fe522b2d72d91bc59c28682bc17c1361b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.1,"baseSeverity":"LOW","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/home-assistant/core","product":"Home Assistant Core","repo":"https://github.com/home-assistant/core","vendor":"home-assistant","versions":[{"lessThan":"2026.5.4","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.1,"baseSeverity":"LOW","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/home-assistant/core/commit/894a68acb678afc382fe5ea9002e61ab7f862011"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/references/2
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://github.com/home-assistant/core/pull/171585"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/references/1
{"name":"Release Notes","tags":["release-notes"],"url":"https://github.com/home-assistant/core/releases/tag/2026.5.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/home-assistant-core-xss-via-shelly-media-player-py-thumb-uri"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c719a41079bfae49e2a40c420b6e9bae7111a1a875787217342681aa6343dec1 · sha256:7d65c761950dc938… · /containers/cna/references/3

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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