Vulnerability details

CVE-2026-65660

Actively exploited

Microsoft SharePoint Enterprise ServerMicrosoft SharePoint Server

Microsoft SharePoint Server Remote Code Execution Vulnerability

CVSS 3.1

8.8High

Official description

Improper control of generation of code ('code injection') 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 < 16.0.5565.1001	CVEProject cvelistV5 (CNA)
Microsoft	Microsoft SharePoint Server 2019	16.0.0 ≤ v < 16.0.10417.20198	CVEProject cvelistV5 (CNA)
Microsoft	Microsoft SharePoint Server Subscription Edition	16.0.0 ≤ v < 16.0.19725.20522	CVEProject cvelistV5 (CNA)

References and advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 vendor-advisorypatch
https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/ third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660 government-resource

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Details

Published: 2026-08-11
Last updated: 2026-10-30
State: Published
Assigner (CNA): microsoft
Kolun priority: 87 · Critical

CISA KEV catalog

Date added: 2026-09-25
Due date: 2026-09-28
Used in ransomware: Unknown

Exploit prediction (EPSS)

9.85%

Probability of exploitation in 30 days

95.5%

Percentile (among all CVEs)

2026-11-079.85%
2026-11-038.18%

SSVC assessment (CISA)

Automatable: No
Exploitation: Active
Technical impact: Total

Weaknesses (CWE)

CWE-94
Improper Control of Generation of Code ('Code Injection')