CVE-2026-45644

HIGHPre-NVD 8.08.0—
EchelonGraph scoreHIGH confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.0Exploit: NoneExposed: 0

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

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Live Share Canvas SDK allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.0
EG Score
8.0(high)
EPSS
42.2%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 9, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45644

Vendor Advisories for CVE-2026-45644(2)

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 39× in last 7d / 173× 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 173 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45644?
CVE-2026-45644 is a high vulnerability published on June 9, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Live Share Canvas SDK allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-45644 disclosed?
CVE-2026-45644 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45644 actively exploited?
CVE-2026-45644 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45644?
CVE-2026-45644 has a CVSS v4.0 base score of 8.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45644?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45644, 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

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