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Recorded 29 Oct 2026 at 20:19 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

CVEMicrosoft Security Response Center

Skype for Business Remote Code Execution Vulnerability

External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.

What it said

CVE
CVE-2026-66302
Severity
Unrated
CVSS base score
Not published
CVSS vector
Not published
Impact
Not stated
Exploitation detected
No known exploitation (MSRC assessment)
Publicly disclosed
No (MSRC assessment)
Exploitability
Exploitation Less Likely
Component
Skype for Business
Weakness
CWE-73: External Control of File Name or Path
Issued by
Microsoft
Customer action
Required: follow the MSRC remediation guidance
Affected products
Updates that fix it
No KB listed
CISA KEV
Not listed in the collected catalog
EPSS
1.0%; scored 29 Oct 2026
Public detection template
No Nuclei template listed
Published
8 Sep 2026 07:00 UTC
Last revised
8 Sep 2026 07:00 UTC
Revision note
Information published.
Public exploit code
No Nuclei template listed

Source evidence when recorded

Microsoft security releases
Complete at observationRead 29 Oct 2026 at 20:17 UTC
CISA KEV
Complete at observationRead 29 Oct 2026 at 20:17 UTC
FIRST EPSS
Complete at observationRead 29 Oct 2026 at 20:17 UTC
Public detection templates (Nuclei)
Complete at observationRead 29 Oct 2026 at 20:17 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. 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)
  2. Fixes: KB5123287: Skype for Business Server Subscription Edition CU1; KB5123300: Skype for Business Server 2019 CU8; KB5123301: Skype for Business Server 2015 CU13 → No KB listed · Affected products: Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, Skype for Business Server Subscription Edition CU1 → · Impact: Remote Code Execution → Not stated · CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C → Not published · CVSS score: 9.8 → Not published · Severity: Critical → Unrated
  3. 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
  4. 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 (39)

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

  1. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  2. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  3. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  4. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  5. 29 Oct 2026 · 18:33:30 UTC EPSS1.0%; scored 28 Oct 2026 → 1.0%; scored 29 Oct 2026
  6. 28 Oct 2026 · 20:00:33 UTC EPSS1.0%; scored 27 Oct 2026 → 1.0%; scored 28 Oct 2026
  7. 27 Oct 2026 · 16:51:02 UTC Updates that fix itKB5123287: Skype for Business Server Subscription Edition CU1; KB5123300: Skype for Business Server 2019 CU8; KB5123301: Skype for Business Server 2015 CU13 → No KB listed
  8. 27 Oct 2026 · 16:51:02 UTC Affected productsSkype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, Skype for Business Server Subscription Edition CU1 →
  9. 27 Oct 2026 · 16:51:02 UTC ImpactRemote Code Execution → Not stated
  10. 27 Oct 2026 · 16:51:02 UTC CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C → Not published
  11. 27 Oct 2026 · 16:51:02 UTC CVSS base score9.8 → Not published
  12. 27 Oct 2026 · 16:51:02 UTC SeverityCritical → Unrated
  13. 27 Oct 2026 · 15:48:13 UTC EPSS1.0%; scored 26 Oct 2026 → 1.0%; scored 27 Oct 2026
  14. 26 Oct 2026 · 23:57:09 UTC EPSS1.0%; scored 25 Oct 2026 → 1.0%; scored 26 Oct 2026
  15. 25 Oct 2026 · 17:12:51 UTC EPSS1.0%; scored 24 Oct 2026 → 1.0%; scored 25 Oct 2026
  16. 25 Oct 2026 · 01:34:18 UTC EPSS1.0%; scored 23 Oct 2026 → 1.0%; scored 24 Oct 2026
  17. 23 Oct 2026 · 15:51:28 UTC EPSS1.0%; scored 22 Oct 2026 → 1.0%; scored 23 Oct 2026
  18. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  19. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  20. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  21. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  22. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  23. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  24. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  25. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  26. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  27. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  28. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  29. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  30. 22 Oct 2026 · 17:33:15 UTC EPSS1.0%; scored 21 Oct 2026 → 1.0%; scored 22 Oct 2026
  31. 21 Oct 2026 · 21:47:24 UTC EPSS1.0%; scored 20 Oct 2026 → 1.0%; scored 21 Oct 2026
  32. 20 Oct 2026 · 20:53:31 UTC EPSS1.0%; scored 19 Oct 2026 → 1.0%; scored 20 Oct 2026
  33. 19 Oct 2026 · 15:12:40 UTC EPSS1.0%; scored 18 Oct 2026 → 1.0%; scored 19 Oct 2026
  34. 18 Oct 2026 · 14:54:30 UTC EPSS1.0%; scored 16 Oct 2026 → 1.0%; scored 18 Oct 2026
  35. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  36. 16 Oct 2026 · 16:13:25 UTC EPSS1.0%; scored 15 Oct 2026 → 1.0%; scored 16 Oct 2026
  37. 15 Oct 2026 · 21:30:54 UTC EPSS1.0%; scored 14 Oct 2026 → 1.0%; scored 15 Oct 2026
  38. 15 Oct 2026 · 01:07:54 UTC EPSS1.0%; scored 13 Oct 2026 → 1.0%; scored 14 Oct 2026
  39. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

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Sources read 1 Nov 14:06 UTC · 275 of 275 readable · 271 fully read · documentation 469/469 current

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