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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

June 19, 2026

Last Modified

August 25, 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 5× in last 7d / 82× 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 333 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 August 25, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 46.9% of all scored CVEs.
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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