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CVE-2026-64918ImportantSpoofingNetwork

Microsoft Office Spoofing Vulnerability

MSRC advisory NVD CVE.org

Assessment

Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.

Severity
Important
CVSS base score
6.5
Impact
Spoofing
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Less Likely
Publicly disclosed
No (MSRC assessment)
EPSS · 30-day forecast
0.9%FIRST forecast dated 10 Nov 2026, for the following 30 days · FIRST percentile 59.2% · about EPSS
Customer action
Required: follow the MSRC remediation guidance
More details
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Microsoft Office
Weakness
CWE-522: Insufficiently Protected Credentials
Issued by
Microsoft
Published
8 Sep 2026 · September 2026
Last revised
8 Sep 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
RequiredUI:R
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
NoneI:N
Availability
NoneA:N

Updates that fix it

1 KB
KBTypeApplies toOther CVEs
KB5002916 Security UpdateMicrosoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)All CVEs in KB5002916

Affected products

Microsoft Office
6 affected products

What changed

  1. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  3. Fixes: No KB listed → KB5002916: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) · Affected products: Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions · Impact: Not stated → Spoofing · Severity: Unrated → Important
  4. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  5. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  6. Detection template: No Nuclei template listed · Customer action: Required: apply the update → Required: follow the MSRC remediation guidance · Public disclosure: No → No (MSRC assessment) · Exploitation detected: Not reported by MSRC → No known exploitation (MSRC assessment)
  7. Fixes: KB5002916: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) → No KB listed · Affected products: Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems · Impact: Spoofing → Not stated · Severity: Important → Unrated
  8. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  9. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (69)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 10 Nov 2026 · 18:32:11 UTC EPSS0.9%; scored 9 Nov 2026 → 0.9%; scored 10 Nov 2026
  2. 9 Nov 2026 · 22:24:37 UTC EPSS0.9%; scored 8 Nov 2026 → 0.9%; scored 9 Nov 2026
  3. 8 Nov 2026 · 15:16:05 UTC EPSS0.9%; scored 7 Nov 2026 → 0.9%; scored 8 Nov 2026
  4. 7 Nov 2026 · 16:12:44 UTC EPSS0.9%; scored 6 Nov 2026 → 0.9%; scored 7 Nov 2026
  5. 6 Nov 2026 · 19:15:37 UTC EPSS0.9%; scored 5 Nov 2026 → 0.9%; scored 6 Nov 2026
  6. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  7. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  8. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  9. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  10. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  11. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  12. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  13. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  14. 5 Nov 2026 · 23:42:03 UTC EPSS0.9%; scored 4 Nov 2026 → 0.9%; scored 5 Nov 2026
  15. 5 Nov 2026 · 02:36:20 UTC EPSS0.9%; scored 3 Nov 2026 → 0.9%; scored 4 Nov 2026
  16. 4 Nov 2026 · 03:04:37 UTC EPSS0.9%; scored 2 Nov 2026 → 0.9%; scored 3 Nov 2026
  17. 3 Nov 2026 · 01:53:36 UTC EPSS0.9%; scored 1 Nov 2026 → 0.9%; scored 2 Nov 2026
  18. 3 Nov 2026 · 01:53:36 UTC Updates that fix itNo KB listed → KB5002916: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
  19. 3 Nov 2026 · 01:53:36 UTC Affected productsMicrosoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions
  20. 3 Nov 2026 · 01:53:36 UTC ImpactNot stated → Spoofing
  21. 3 Nov 2026 · 01:53:36 UTC SeverityUnrated → Important
  22. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  23. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  24. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  25. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  26. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  27. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  28. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  29. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  30. 2 Nov 2026 · 00:36:51 UTC EPSS0.9%; scored 31 Oct 2026 → 0.9%; scored 1 Nov 2026
  31. 31 Oct 2026 · 18:22:15 UTC EPSS0.9%; scored 30 Oct 2026 → 0.9%; scored 31 Oct 2026
  32. 30 Oct 2026 · 18:02:45 UTC EPSS0.9%; scored 29 Oct 2026 → 0.9%; scored 30 Oct 2026
  33. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  34. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  35. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  36. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  37. 29 Oct 2026 · 18:33:30 UTC EPSS0.9%; scored 28 Oct 2026 → 0.9%; scored 29 Oct 2026
  38. 28 Oct 2026 · 20:00:33 UTC EPSS0.9%; scored 27 Oct 2026 → 0.9%; scored 28 Oct 2026
  39. 27 Oct 2026 · 16:51:02 UTC Updates that fix itKB5002916: Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition) → No KB listed
  40. 27 Oct 2026 · 16:51:02 UTC Affected productsMicrosoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC 2024 for 64-bit editions → Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems
  41. 27 Oct 2026 · 16:51:02 UTC ImpactSpoofing → Not stated
  42. 27 Oct 2026 · 16:51:02 UTC SeverityImportant → Unrated
  43. 27 Oct 2026 · 15:48:13 UTC EPSS0.9%; scored 26 Oct 2026 → 0.9%; scored 27 Oct 2026
  44. 26 Oct 2026 · 23:57:09 UTC EPSS0.9%; scored 25 Oct 2026 → 0.9%; scored 26 Oct 2026
  45. 25 Oct 2026 · 17:12:51 UTC EPSS0.9%; scored 24 Oct 2026 → 0.9%; scored 25 Oct 2026
  46. 25 Oct 2026 · 01:34:18 UTC EPSS0.9%; scored 23 Oct 2026 → 0.9%; scored 24 Oct 2026
  47. 23 Oct 2026 · 15:51:28 UTC EPSS0.9%; scored 22 Oct 2026 → 0.9%; scored 23 Oct 2026
  48. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  49. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  50. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  51. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  52. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  53. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  54. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  55. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  56. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  57. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  58. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  59. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  60. 22 Oct 2026 · 17:33:15 UTC EPSS0.9%; scored 21 Oct 2026 → 0.9%; scored 22 Oct 2026
  61. 21 Oct 2026 · 21:47:24 UTC EPSS0.9%; scored 20 Oct 2026 → 0.9%; scored 21 Oct 2026
  62. 20 Oct 2026 · 20:53:31 UTC EPSS0.9%; scored 19 Oct 2026 → 0.9%; scored 20 Oct 2026
  63. 19 Oct 2026 · 15:12:40 UTC EPSS0.9%; scored 18 Oct 2026 → 0.9%; scored 19 Oct 2026
  64. 18 Oct 2026 · 14:54:30 UTC EPSS0.9%; scored 16 Oct 2026 → 0.9%; scored 18 Oct 2026
  65. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  66. 16 Oct 2026 · 16:13:25 UTC EPSS0.9%; scored 15 Oct 2026 → 0.9%; scored 16 Oct 2026
  67. 15 Oct 2026 · 21:30:54 UTC EPSS0.9%; scored 14 Oct 2026 → 0.9%; scored 15 Oct 2026
  68. 15 Oct 2026 · 01:07:54 UTC EPSS0.9%; scored 13 Oct 2026 → 0.9%; scored 14 Oct 2026
  69. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-64918. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-64918

Published

Microsoft Office Spoofing Vulnerability

Insufficiently protected credentials in Microsoft Office allows an unauthorized attacker to perform spoofing over a network.

Source published
8 Sep 2026 17:16:53 UTC
Source modified
31 Oct 2026 16:15:31 UTC
Observed here
31 Oct 2026 18:04:47 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

ChangeIntel

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Sources read 11 Nov 03:41 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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