CVE-2026-64823

MEDIUMPre-NVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

Score 4.7 from GitHub Security Advisory (severity: LOW) published 2026-07-21. a secondary CVSS source baseline 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 theft of session tokens from local storage and authenticated calls to sensitive service endpoints including lock, alarm, and cover controls.

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity47% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 22, 2026

Advisory Details (4)

Auto-updated Jul 21, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

Home Assistant Core < 2026.5.4 XSS via Shelly media_player.py thumb URI | Advisories | VulnCheck

https://www.vulncheck.com/advisories/home-assistant-core-xss-via-shelly-media-player-py-thumb-uri
github_release Patch Available

2026.5.4

Patch available: home-assistant/core 2026.5.4

https://github.com/home-assistant/core/releases/tag/2026.5.4
github_pr Patch Available

Fix `media_image_hash` and validate the MIME type in the Shelly media player

Patch available: home-assistant/core 2026.6.0b0 (PR #171585 merged 2026-05-20)

https://github.com/home-assistant/core/pull/171585
github_commit Patch Available

commit 894a68acb678 (home-assistant/core)

Patch available: home-assistant/core 2026.6.0b0 (contains commit 894a68acb678)

https://github.com/home-assistant/core/commit/894a68acb678afc382fe5ea9002e61ab7f862011

Vendor Advisories for CVE-2026-64823(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 77× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-08-30 02:18 UTCEG score recompute
  2. 2026-08-30 02:18 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 02:05 UTCEG score recompute
  6. 2026-08-28 02:05 UTCGHSA enrichment
  7. 2026-08-27 01:37 UTCEG score recompute
  8. 2026-08-27 01:37 UTCGHSA enrichment
  9. 2026-08-26 14:47 UTCEPSS rescore
  10. 2026-08-26 01:13 UTCEG score recompute
  11. 2026-08-26 01:13 UTCGHSA enrichment
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-25 00:42 UTCEG score recompute
  14. 2026-08-25 00:42 UTCGHSA enrichment
  15. 2026-08-24 00:18 UTCEG score recompute
  16. 2026-08-24 00:18 UTCGHSA enrichment
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-22 23:54 UTCEG score recompute
  19. 2026-08-22 23:54 UTCGHSA enrichment
  20. 2026-08-21 23:49 UTCEPSS rescore
  21. 2026-08-21 23:29 UTCGHSA enrichment
  22. 2026-08-20 23:04 UTCEG score recompute
  23. 2026-08-20 23:04 UTCGHSA enrichment
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 22:39 UTCEG score recompute
Show 75 more
  1. 2026-08-19 22:39 UTCGHSA enrichment
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-18 21:48 UTCEG score recompute
  4. 2026-08-18 21:48 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 20:54 UTCEG score recompute
  7. 2026-08-17 20:54 UTCGHSA enrichment
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-16 19:29 UTCEG score recompute
  10. 2026-08-16 19:29 UTCGHSA enrichment
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-15 19:05 UTCEG score recompute
  13. 2026-08-15 19:05 UTCGHSA enrichment
  14. 2026-08-15 01:30 UTCEPSS rescore
  15. 2026-08-14 18:40 UTCEG score recompute
  16. 2026-08-14 18:40 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 18:14 UTCGHSA enrichment
  19. 2026-08-12 17:50 UTCEG score recompute
  20. 2026-08-12 17:50 UTCGHSA enrichment
  21. 2026-08-12 13:51 UTCEPSS rescore
  22. 2026-08-11 17:25 UTCEG score recompute
  23. 2026-08-11 17:25 UTCGHSA enrichment
  24. 2026-08-11 00:00 UTCEPSS rescore
  25. 2026-08-10 16:51 UTCGHSA enrichment
  26. 2026-08-09 16:26 UTCEG score recompute
  27. 2026-08-09 16:26 UTCGHSA enrichment
  28. 2026-08-09 13:47 UTCEPSS rescore
  29. 2026-08-08 16:37 UTCEPSS rescore
  30. 2026-08-08 16:02 UTCEG score recompute
  31. 2026-08-08 16:02 UTCGHSA enrichment
  32. 2026-08-07 15:37 UTCGHSA enrichment
  33. 2026-08-06 15:13 UTCEG score recompute
  34. 2026-08-06 15:13 UTCGHSA enrichment
  35. 2026-08-06 13:47 UTCEPSS rescore
  36. 2026-08-05 19:17 UTCEPSS rescore
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 14:48 UTCEG score recompute
  39. 2026-08-05 14:48 UTCGHSA enrichment
  40. 2026-08-04 15:10 UTCEPSS rescore
  41. 2026-08-04 14:18 UTCEG score recompute
  42. 2026-08-04 14:18 UTCGHSA enrichment
  43. 2026-08-04 10:39 UTCEPSS rescore
  44. 2026-08-03 13:53 UTCEG score recompute
  45. 2026-08-03 13:53 UTCGHSA enrichment
  46. 2026-08-03 10:36 UTCEPSS rescore
  47. 2026-08-02 13:28 UTCEG score recompute
  48. 2026-08-02 13:28 UTCGHSA enrichment
  49. 2026-08-02 02:27 UTCEPSS rescore
  50. 2026-08-01 13:04 UTCGHSA enrichment
  51. 2026-07-31 12:39 UTCEG score recompute
  52. 2026-07-31 12:39 UTCGHSA enrichment
  53. 2026-07-30 16:28 UTCEPSS rescore
  54. 2026-07-30 12:13 UTCEG score recompute
  55. 2026-07-30 12:13 UTCGHSA enrichment
  56. 2026-07-30 01:30 UTCEPSS rescore
  57. 2026-07-30 01:30 UTCEPSS rescore
  58. 2026-07-29 11:48 UTCEG score recompute
  59. 2026-07-29 11:48 UTCGHSA enrichment
  60. 2026-07-28 15:37 UTCEPSS rescore
  61. 2026-07-28 11:23 UTCEG score recompute
  62. 2026-07-28 11:23 UTCGHSA enrichment
  63. 2026-07-27 14:14 UTCEPSS rescore
  64. 2026-07-27 10:57 UTCEG score recompute
  65. 2026-07-27 10:56 UTCGHSA enrichment
  66. 2026-07-26 14:54 UTCEPSS rescore
  67. 2026-07-26 14:54 UTCEPSS rescore
  68. 2026-07-26 10:31 UTCEG score recompute
  69. 2026-07-26 10:31 UTCGHSA enrichment
  70. 2026-07-26 10:31 UTCGHSA enrichment
  71. 2026-07-25 14:18 UTCEPSS rescore
  72. 2026-07-25 14:18 UTCEPSS rescore
  73. 2026-07-24 14:18 UTCEPSS rescore
  74. 2026-07-24 14:18 UTCEPSS rescore
  75. 2026-07-23 14:18 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-64823?
CVE-2026-64823 is a medium vulnerability published on July 21, 2026. Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's asyncgetmedia_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…
When was CVE-2026-64823 disclosed?
CVE-2026-64823 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64823 actively exploited?
CVE-2026-64823 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64823?
CVE-2026-64823 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-64823?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64823, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-64823

Explore →

Is Your Infrastructure Affected by CVE-2026-64823?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs