CVE-2026-47645

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 0

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

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
51.4%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 15, 2026

Advisory Details (1)

Auto-updated Jun 22, 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-2026-47645

Vendor Advisories for CVE-2026-47645(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 8× in last 7d / 127× 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 153 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-47645?
CVE-2026-47645 is a high vulnerability published on June 19, 2026. Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-47645 disclosed?
CVE-2026-47645 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47645 actively exploited?
CVE-2026-47645 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47645?
CVE-2026-47645 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-47645?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47645, 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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