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CVE-2026-55946CriticalInformation DisclosureNetworkRevised 27 Oct

Microsoft Copilot Information Disclosure Vulnerability

MSRC advisory NVD CVE.org

Assessment

Ai command injection in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Severity
Critical
CVSS base score
6.1
Impact
Information Disclosure
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Not assessed
Publicly disclosed
No (MSRC assessment)
EPSS · 30-day forecast
0.4%FIRST forecast dated 10 Nov 2026, for the following 30 days · FIRST percentile 33.4% · about EPSS
Customer action
Not required (service-side fix)
More details
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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 Copilot
Weakness
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Issued by
Microsoft
Published
17 Sep 2026 · September 2026
Last revised
27 Oct 2026Updated an acknowledgement. This is an informational change only.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
NonePR:N
User interaction
RequiredUI:R
Scope
ChangedS:C
Confidentiality
HighC:H
Integrity
NoneI:N
Availability
NoneA:N

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Other
1 affected product
  • Microsoft Copilot

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. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  5. Detection template: No Nuclei template listed · Public disclosure: No → No (MSRC assessment) · Exploitation detected: Not reported by MSRC → No known exploitation (MSRC assessment)
  6. Publisher revision note: Information published. → Updated an acknowledgement. This is an informational change only.
  7. 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
  8. 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 (62)

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

  1. 10 Nov 2026 · 18:32:11 UTC EPSS0.4%; scored 9 Nov 2026 → 0.4%; scored 10 Nov 2026
  2. 9 Nov 2026 · 22:24:37 UTC EPSS0.4%; scored 8 Nov 2026 → 0.4%; scored 9 Nov 2026
  3. 8 Nov 2026 · 15:16:05 UTC EPSS0.4%; scored 7 Nov 2026 → 0.4%; scored 8 Nov 2026
  4. 7 Nov 2026 · 16:12:44 UTC EPSS0.4%; scored 6 Nov 2026 → 0.4%; scored 7 Nov 2026
  5. 6 Nov 2026 · 19:15:37 UTC EPSS0.4%; scored 5 Nov 2026 → 0.4%; 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 EPSS0.4%; scored 4 Nov 2026 → 0.4%; scored 5 Nov 2026
  15. 5 Nov 2026 · 02:36:20 UTC EPSS0.4%; scored 3 Nov 2026 → 0.4%; scored 4 Nov 2026
  16. 4 Nov 2026 · 03:04:37 UTC EPSS0.4%; scored 2 Nov 2026 → 0.4%; scored 3 Nov 2026
  17. 3 Nov 2026 · 01:53:36 UTC EPSS0.4%; scored 1 Nov 2026 → 0.4%; scored 2 Nov 2026
  18. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  19. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  20. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  21. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  22. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  23. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  24. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  25. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  26. 2 Nov 2026 · 00:36:51 UTC EPSS0.4%; scored 31 Oct 2026 → 0.4%; scored 1 Nov 2026
  27. 31 Oct 2026 · 18:22:15 UTC EPSS0.4%; scored 30 Oct 2026 → 0.4%; scored 31 Oct 2026
  28. 30 Oct 2026 · 18:02:45 UTC EPSS0.4%; scored 29 Oct 2026 → 0.4%; scored 30 Oct 2026
  29. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  30. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  31. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  32. 29 Oct 2026 · 18:33:30 UTC EPSS0.4%; scored 28 Oct 2026 → 0.4%; scored 29 Oct 2026
  33. 29 Oct 2026 · 01:10:40 UTC Revision noteInformation published. → Updated an acknowledgement. This is an informational change only.
  34. 29 Oct 2026 · 01:10:40 UTC Last revised17 Sep 2026 07:00 UTC → 27 Oct 2026 07:00 UTC
  35. 28 Oct 2026 · 20:00:33 UTC EPSS0.4%; scored 27 Oct 2026 → 0.4%; scored 28 Oct 2026
  36. 27 Oct 2026 · 15:48:13 UTC EPSS0.4%; scored 26 Oct 2026 → 0.4%; scored 27 Oct 2026
  37. 26 Oct 2026 · 23:57:09 UTC EPSS0.4%; scored 25 Oct 2026 → 0.4%; scored 26 Oct 2026
  38. 25 Oct 2026 · 17:12:51 UTC EPSS0.4%; scored 24 Oct 2026 → 0.4%; scored 25 Oct 2026
  39. 25 Oct 2026 · 01:34:18 UTC EPSS0.4%; scored 23 Oct 2026 → 0.4%; scored 24 Oct 2026
  40. 23 Oct 2026 · 15:51:28 UTC EPSS0.4%; scored 22 Oct 2026 → 0.4%; scored 23 Oct 2026
  41. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  42. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  43. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  44. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  45. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  46. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  47. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  48. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  49. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  50. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  51. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  52. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  53. 22 Oct 2026 · 17:33:15 UTC EPSS0.4%; scored 21 Oct 2026 → 0.4%; scored 22 Oct 2026
  54. 21 Oct 2026 · 21:47:24 UTC EPSS0.4%; scored 20 Oct 2026 → 0.4%; scored 21 Oct 2026
  55. 20 Oct 2026 · 20:53:31 UTC EPSS0.4%; scored 19 Oct 2026 → 0.4%; scored 20 Oct 2026
  56. 19 Oct 2026 · 15:12:40 UTC EPSS0.4%; scored 18 Oct 2026 → 0.4%; scored 19 Oct 2026
  57. 18 Oct 2026 · 14:54:30 UTC EPSS0.4%; scored 16 Oct 2026 → 0.4%; scored 18 Oct 2026
  58. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  59. 16 Oct 2026 · 16:13:25 UTC EPSS0.4%; scored 15 Oct 2026 → 0.4%; scored 16 Oct 2026
  60. 15 Oct 2026 · 21:30:54 UTC EPSS0.4%; scored 14 Oct 2026 → 0.4%; scored 15 Oct 2026
  61. 15 Oct 2026 · 01:07:54 UTC EPSS0.4%; scored 13 Oct 2026 → 0.4%; scored 14 Oct 2026
  62. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-55946. 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-2026-55946

Published

Microsoft Copilot Information Disclosure Vulnerability

Ai command injection in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Source published
17 Sep 2026 22:55:52 UTC
Source modified
10 Nov 2026 21:29:11 UTC
Observed here
10 Nov 2026 23:21:22 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 · 6.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C

ChangeIntel

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Sources read 11 Nov 05:47 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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