CVE-2026-20963

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2026-20963

Confirmed

Yes

2026-03-18 00:00 UTC

Timestamps

2026-03-18

2026-03-18

Scope

KEV entry: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability | Affected: Microsoft / SharePoint | Description: Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-03-21 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20963

References
  • {'id': 'CVE-2026-20963', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20963'}

55d6c9b1-6d03-4d64-9932-622f93a26882

405284c2-e461-4670-8979-7fd2c9755a60

2026-03-18 21:00 UTC

2026-03-18 21:00 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-502"
  ],
  "date_added": "2026-03-18",
  "due_date": "2026-03-21",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "SharePoint",
  "vendorProject": "Microsoft",
  "vulnerabilityName": "Microsoft SharePoint Deserialization of Untrusted Data Vulnerability"
}
 -
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