Vulnerability details
CVE-2026-45659
Actively exploited
Microsoft SharePoint Enterprise ServerMicrosoft SharePoint Server
Microsoft SharePoint Remote Code Execution Vulnerability
CVSS 3.1
8.8High
Official description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:L/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 < 16.0.5552.1002 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 ≤ v < 16.0.10417.20128 | CVEProject cvelistV5 (CNA) |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 ≤ v < 16.0.19725.20280 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 vendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45659 government-resource
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Details
- Published
- 2026-05-23
- Last updated
- 2026-08-11
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 88 · Critical
CISA KEV catalog
- Date added
- 2026-07-01
- Due date
- 2026-07-04
- Used in ransomware
- Yes
Exploit prediction (EPSS)
80.24%
Probability of exploitation in 30 days
99.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-502Deserialization of Untrusted Data