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Known Exploited Vulnerability
8.8
HIGH CVSS 3.1
CVE-2026-65660
Microsoft SharePoint Code Injection Vulnerability - [Actively Exploited]
Overview
Description

Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Details
INFO

Published Date :

Aug. 11, 2026, 5:18 p.m.

Last Modified :

Sept. 26, 2026, 4:17 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.

Required Action :

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Known Ransomware Campaign Use:

Unknown

Notes :

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65660

Impact
Affected Products

The following products are affected by CVE-2026-65660 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft sharepoint_server
2 Microsoft sharepoint_enterprise_server_2016
3 Microsoft sharepoint_server_2016
4 Microsoft sharepoint_server_2019
: Total Affected Vendor : 1 | Products : 4
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 MEDIUM f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-65660.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 Patch Vendor Advisory
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 US Government Resource
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-65660 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-65660 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-65660 vulnerability anywhere in the article.

  • europa.eu
Cyber Brief 26-10 - September 2026

Cyber Brief (September 2026)October 2, 2026 - Version 1TLP:CLEARExecutive summaryWe analysed 358 open source reports for this Cyber Brief1.Relating to cyber policy and law enforcement, Dutch police ar ... Read more

Published Date: Oct 02, 2026 (1 week, 6 days ago)
  • TheCyberThrone
Four More Vulnerabilities Enter CISA KEV

CISA has added four vulnerabilities affecting WSO2, Adobe Commerce, Microsoft SharePoint and MikroTik RouterOS to its Known Exploited Vulnerabilities (KEV) Catalog.Hacking & CrackingThe common factor ... Read more

Published Date: Sep 28, 2026 (2 weeks, 3 days ago)
  • security.nl
Microsoft SharePoint-servers aangevallen via recent beveiligingslek

Aanvallers maken actief misbruik van een kwetsbaarheid in Microsoft SharePoint waarvoor vorige maand updates verschenen, zo waarschuwt Microsoft. Via het beveiligingslek (CVE-2026-65660) is remote cod ... Read more

Published Date: Sep 28, 2026 (2 weeks, 3 days ago)
  • The Hacker News
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) ca ... Read more

Published Date: Sep 26, 2026 (2 weeks, 5 days ago)
  • The Hacker News
SharePoint Flaw Initially Listed as Spoofing by Microsoft Enables Authenticated RCE

A SharePoint Server vulnerability that Microsoft initially classified as a spoofing flaw with a CVSS score of 6.5 actually enables authenticated remote code execution, according to full technical deta ... Read more

Published Date: Sep 22, 2026 (3 weeks, 2 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-65660 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 26, 2026

    Action Type Old Value New Value
    Removed SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-25T15:40:09.216765Z'}
    Added SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T00:00:00+00:00'}
  • Modified Analysis by [email protected]

    Sep. 25, 2026

    Action Type Old Value New Value
    Added Reference Type CISA-ADP: https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/ Types: Third Party Advisory
    Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660 Types: US Government Resource
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 25, 2026

    Action Type Old Value New Value
    Added Reference https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/
    Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660
    Removed SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T00:00:00+00:00'}
    Added SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'active'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-25T15:40:09.216765Z'}
  • CVE CISA KEV Update by 9119a7d8-5eab-497f-8521-727c672e3725

    Sep. 25, 2026

    Action Type Old Value New Value
    Added Date Added 2026-09-25
    Added Due Date 2026-09-25
    Added Required Action 2026-09-25
    Added Vulnerability Name 2026-09-25
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 25, 2026

    Action Type Old Value New Value
    Removed SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T18:40:12.758725Z'}
    Added SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T00:00:00+00:00'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 24, 2026

    Action Type Old Value New Value
    Removed SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-11T20:38:18.942475Z'}
    Added SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-24T18:40:12.758725Z'}
  • CVE Modified by [email protected]

    Aug. 27, 2026

    Action Type Old Value New Value
    Changed Description Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network. Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Removed CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
    Removed Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
    Removed Reference Type https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 Types: Patch, Vendor Advisory
  • Initial Analysis by [email protected]

    Aug. 13, 2026

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* *cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:* *cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* versions up to (excluding) 16.0.19725.20522
    Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 Types: Patch, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 11, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-65660', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-11T20:38:18.942475Z'}
  • New CVE Received by [email protected]

    Aug. 11, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Enterprise Server 2016', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.5565.1001', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Server 2019', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.10417.20198', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft SharePoint Server Subscription Edition', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.19725.20522', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}]
    Added Description Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
    Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    Added CWE CWE-94
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact