CVE-2026-20963 kev in the critical feed json
Microsoft SharePoint Remote Code Execution Vulnerability
published 2026-01-13 9 mo ago modified 2026-07-30 3 mo ago also EUVD-2026-2114
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2026-03-18
- epss
- 29.2%
- EPSS 29.2% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Patch / fix
cisa 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.
- Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.5535.1001
- Microsoft Microsoft SharePoint Server 2019 16.0.10417.20083
- Microsoft Microsoft SharePoint Server Subscription Edition 16.0.19127.20442
Timeline
- CISA SSVC: exploitation active
- Published
- Added to CISA KEV
- CISA patch deadline
Known exploited
- Added
- 7 mo ago
- Patch by
- 2026-03-21 (7 mo ago)
- Ransomware
- Not known
- 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.
- Vendor, product
- Microsoft, SharePoint
- CISA name
- Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 10 mo ago
Exploit prediction
29.20% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft SharePoint Enterprise Server 2016
- Microsoft Microsoft SharePoint Server 2019
- Microsoft Microsoft SharePoint Server Subscription Edition
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-20963
vendor-advisory, patch
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963
government-resource, us-government-resource
Sources
- CVE List CVE-2026-20963
- NVD CVE-2026-20963
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.