CVE-2026-20963

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-03-18), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 33%CVSS: 9.8Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
33%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

January 13, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Sep 18, 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-2026-20963
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963

Vendor Advisories for CVE-2026-20963(1)

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 93× in last 7d / 387× 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 1,416 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2026-20963?
CVE-2026-20963 is a critical vulnerability published on January 13, 2026. Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
When was CVE-2026-20963 disclosed?
CVE-2026-20963 was first published in the National Vulnerability Database on January 13, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20963 actively exploited?
Yes. CISA added CVE-2026-20963 to the Known Exploited Vulnerabilities catalog on March 18, 2026, affecting Microsoft SharePoint. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-20963?
CVE-2026-20963 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-20963?
CVE-2026-20963 affects Microsoft SharePoint. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-20963?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20963, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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