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CVE-2026-66302Unrated

Skype for Business Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Unrated
CVSS base score
Not published
Impact
Not stated
EPSS · 30-day forecast
1.0%FIRST forecast dated 31 Oct 2026, for the following 30 days · FIRST percentile 62.1% · about EPSS
Public detection template
No Nuclei template is listed in the current collected catalog
Exploitation detected
No known exploitation (MSRC assessment)
Exploitability
Exploitation Less Likely
Publicly disclosed
No (MSRC assessment)
Customer action
Required: follow the MSRC remediation guidance
Component
Skype for Business
Weakness
CWE-73: External Control of File Name or Path
Issued by
Microsoft
Published
8 Sep 2026 · September 2026
Last revised
8 Sep 2026

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.

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 (41)

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

  1. 31 Oct 2026 · 18:22:15 UTC EPSS1.0%; scored 30 Oct 2026 → 1.0%; scored 31 Oct 2026
  2. 30 Oct 2026 · 18:02:45 UTC EPSS1.0%; scored 29 Oct 2026 → 1.0%; scored 30 Oct 2026
  3. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  4. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  5. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → No (MSRC assessment)
  6. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → No known exploitation (MSRC assessment)
  7. 29 Oct 2026 · 18:33:30 UTC EPSS1.0%; scored 28 Oct 2026 → 1.0%; scored 29 Oct 2026
  8. 28 Oct 2026 · 20:00:33 UTC EPSS1.0%; scored 27 Oct 2026 → 1.0%; scored 28 Oct 2026
  9. 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
  10. 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 →
  11. 27 Oct 2026 · 16:51:02 UTC ImpactRemote Code Execution → Not stated
  12. 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
  13. 27 Oct 2026 · 16:51:02 UTC CVSS base score9.8 → Not published
  14. 27 Oct 2026 · 16:51:02 UTC SeverityCritical → Unrated
  15. 27 Oct 2026 · 15:48:13 UTC EPSS1.0%; scored 26 Oct 2026 → 1.0%; scored 27 Oct 2026
  16. 26 Oct 2026 · 23:57:09 UTC EPSS1.0%; scored 25 Oct 2026 → 1.0%; scored 26 Oct 2026
  17. 25 Oct 2026 · 17:12:51 UTC EPSS1.0%; scored 24 Oct 2026 → 1.0%; scored 25 Oct 2026
  18. 25 Oct 2026 · 01:34:18 UTC EPSS1.0%; scored 23 Oct 2026 → 1.0%; scored 24 Oct 2026
  19. 23 Oct 2026 · 15:51:28 UTC EPSS1.0%; scored 22 Oct 2026 → 1.0%; scored 23 Oct 2026
  20. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  21. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  22. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  23. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  24. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  25. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  26. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  27. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  28. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  29. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  30. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  31. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  32. 22 Oct 2026 · 17:33:15 UTC EPSS1.0%; scored 21 Oct 2026 → 1.0%; scored 22 Oct 2026
  33. 21 Oct 2026 · 21:47:24 UTC EPSS1.0%; scored 20 Oct 2026 → 1.0%; scored 21 Oct 2026
  34. 20 Oct 2026 · 20:53:31 UTC EPSS1.0%; scored 19 Oct 2026 → 1.0%; scored 20 Oct 2026
  35. 19 Oct 2026 · 15:12:40 UTC EPSS1.0%; scored 18 Oct 2026 → 1.0%; scored 19 Oct 2026
  36. 18 Oct 2026 · 14:54:30 UTC EPSS1.0%; scored 16 Oct 2026 → 1.0%; scored 18 Oct 2026
  37. 18 Oct 2026 · 14:54:30 UTC Link: September 2026/security?release=2026-Sep#cves
  38. 16 Oct 2026 · 16:13:25 UTC EPSS1.0%; scored 15 Oct 2026 → 1.0%; scored 16 Oct 2026
  39. 15 Oct 2026 · 21:30:54 UTC EPSS1.0%; scored 14 Oct 2026 → 1.0%; scored 15 Oct 2026
  40. 15 Oct 2026 · 01:07:54 UTC EPSS1.0%; scored 13 Oct 2026 → 1.0%; scored 14 Oct 2026
  41. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-66302. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-66302

Published

Skype for Business Server 2015 CU13

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Skype for Business Server 2015 CU13",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "9319.0",
                            "lessThan": "6.0.9319.885",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Skype for Business Server 2019 CU8

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Skype for Business Server 2019 CU8",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "2046.0",
                            "lessThan": "7.0.2046.569",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Skype for Business Server Subscription Edition CU1

Vendor product

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Microsoft",
                    "product": "Skype for Business Server Subscription Edition CU1",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "2046.0",
                            "lessThan": "7.0.2046.879",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

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

ChangeIntel

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Sources read 1 Nov 15:09 UTC · 275 of 275 readable · 272 fully read · documentation 469/469 current

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