CVE-2026-65660

CRITICALPre-NVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-25), indicating real-world exploitation has been confirmed by US federal agencies. The CNA's CVSS baseline 8.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, cna:microsoft, epss, ghsa
Trending — KEV-added this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2.1%CVSS: 8.8Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.
EPSS PROB
2.1%
EPSS %ILE
81st
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

A fix is available. Apply it within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-65660

Vendor Advisories for CVE-2026-65660(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 103× in last 7d / 277× 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 475 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-65660?
CVE-2026-65660 is a critical vulnerability published on August 11, 2026. Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
When was CVE-2026-65660 disclosed?
CVE-2026-65660 was first published on August 11, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65660 actively exploited?
Yes. CISA added CVE-2026-65660 to the Known Exploited Vulnerabilities catalog on September 25, 2026, affecting Microsoft SharePoint. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2026-65660?
CVE-2026-65660 has a CVSS base score of 8.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2026-65660?
CVE-2026-65660 affects Microsoft SharePoint.
How do I remediate CVE-2026-65660?
A fix for CVE-2026-65660 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-65660 are linked in the Vendor Advisories panel on this page.

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