High severity · published Aug 11, 2026
CVE-2026-65660
Microsoft SharePoint Server Remote Code Execution Vulnerability
In wildKEV
8.8
CVSS
8.2%
EPSS
Yes
On KEV
Description
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)8.2% · higher than 95% of CVEs
Exploited in the wildYes
CISA KEVListed Sep 25, 2026
Federal remediation dueSep 28, 2026
Ransomware campaign useNot known
Affected products
Which versions
SH
SharePoint · Microsoft
before 16.0.19725.20522; 2016; 2019 · source: NVD, KEV
MS
Microsoft SharePoint Enterprise Server 2016 · Microsoft
16.0.0 before 16.0.5565.1001 · source: vendor
MS
Microsoft SharePoint Server 2019 · Microsoft
16.0.0 before 16.0.10417.20198 · source: vendor
MS
Microsoft SharePoint Server Subscription Edition · Microsoft
16.0.0 before 16.0.19725.20522 · source: vendor
In the news
VulnerabilityHigh
SharePoint RCE and MikroTik RouterOS Flaws Actively Exploited in the Wild
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added two security flaws impacting Microsoft SharePoint and Mikrotik RouterOS to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerabilities in question are as follows - CVE-2026-65660 (CVSS score: 8.8) - A code injection vulnerability in Microsoft Office SharePoint
Sep 26, 2026·The Hacker News
AdvisoryHigh
U.S. CISA adds Microsoft SharePoint and Mikrotik RouterOS flaws to its Known Exploited Vulnerabilities catalog
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Microsoft SharePoint and Mikrotik RouterOS flaws flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the following vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: CVE-2026-65660 is a code-injection vulnerability in Microsoft SharePoint Server that allows an authenticated, low-privileged attacker to execute arbitrary […]
Sep 25, 2026·Security Affairs
AdvisoryHigh
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-65660 Microsoft SharePoint Code Injection Vulnerability CVE-2026-67279 Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise.  Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.  While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .  Aware of ...
Sep 25, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-65660: Microsoft SharePoint - Microsoft SharePoint Code Injection Vulnerability
Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.
SHSharePointCVE-2026-65660
Sep 25, 2026·CISA KEV
Affected product
SH
SharePoint
Microsoft
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