CVE-2026-65663

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. The CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.0%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 45%
Exploitation2% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.0%
EPSS %ILE
80th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (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-2026-65663

Vendor Advisories for CVE-2026-65663(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 27× in last 7d / 141× 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 362 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-65663?
CVE-2026-65663 is a high vulnerability published on August 11, 2026. Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
When was CVE-2026-65663 disclosed?
CVE-2026-65663 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-2026-65663 actively exploited?
CVE-2026-65663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65663?
CVE-2026-65663 has a CVSS base score of 8.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-65663?
A fix for CVE-2026-65663 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-65663 are linked in the Vendor Advisories panel on this page.

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