Vulnerability details
CVE-2026-20963
Actively exploited
Microsoft SharePoint Enterprise ServerMicrosoft SharePoint Server
Microsoft SharePoint Remote Code Execution Vulnerability
CVSS 3.1
9.8Critical
Official description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 ≤ v < 16.0.5535.1001 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 ≤ v < 16.0.10417.20083 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 ≤ v < 16.0.19127.20442 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963 vendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963 government-resource
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Details
- Published
- 2026-01-13
- Last updated
- 2026-07-31
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 89 · Critical
CISA KEV catalog
- Date added
- 2026-03-18
- Due date
- 2026-03-21
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
29.2%
Probability of exploitation in 30 days
98.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-502Deserialization of Untrusted Data