Incident Score: Analysis & Impact (MIC1790584378)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Microsoft_SharePoint's Vulnerability and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts Microsoft_SharePoint Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the Microsoft_SharePoint breach identified under incident ID MIC1790584378.
The analysis begins with a detailed overview of Microsoft_SharePoint's information like the linkedin page: https://www.linkedin.com/company/microsoft_sharepoint, the number of followers: 0, the industry type: Software Development and the number of employees: None employees
After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 666 and after the incident was 661 with a difference of -5 which is could be a good indicator of the severity and impact of the incident.
In the next step of the video, we will analyze in more details the incident and the impact it had on Microsoft_SharePoint and their customers.
A newly reported cybersecurity incident, "Critical Microsoft SharePoint RCE Vulnerability (CVE-2026-65660) Actively Exploited in the Wild", has drawn attention.
A critical remote code execution (RCE) vulnerability, CVE-2026-65660, has been confirmed as actively exploited in enterprise environments.
The disruption is felt across the environment, affecting Microsoft SharePoint Server 2016, 2019, Subscription Edition, and unsupported SharePoint Server 2013, and exposing Potential data exfiltration (sensitivity not specified).
In response, moved swiftly to contain the threat with measures like Disable anonymous access, Network segmentation and Monitor for malformed Register directives, and began remediation that includes Apply Microsoft security update (August 11, 2026) and Upgrade or isolate unsupported SharePoint Server 2013 instances.
The case underscores how Ongoing (public PoC available, active exploitation confirmed), and recommending next steps like Patch immediately using Microsoft’s August 11, 2026 security update, Disable anonymous access where unnecessary and Monitor for malformed Register directives and deserialization activity.
Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.
The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Exploit Public-Facing Application (T1190) with high confidence (90%), supported by evidence indicating critical RCE vulnerability (CVE-2026-65660) actively exploited in the wild and Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating allows authenticated, low-privileged users to execute arbitrary code. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with high confidence (90%), supported by evidence indicating deserialization of attacker-supplied XAML payloads via XamlServices.Parse() and Command and Scripting Interpreter (T1059) with moderate to high confidence (70%), supported by evidence indicating arbitrary code execution on vulnerable SharePoint systems. Under the Persistence tactic, the analysis identified Server Software Component: Web Shell (T1505.003) with moderate to high confidence (80%), supported by evidence indicating threat actors deploying in-memory webshells to evade detection. Under the Privilege Escalation tactic, the analysis identified Exploitation for Privilege Escalation (T1068) with moderate to high confidence (70%), supported by evidence indicating low-privileged users to execute arbitrary code on vulnerable systems. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate to high confidence (80%), supported by evidence indicating in-memory webshells to evade detection and Exploitation for Defense Evasion (T1211) with moderate to high confidence (70%), supported by evidence indicating improper handling of Register directives in SafeControls mechanism. Under the Lateral Movement tactic, the analysis identified Exploitation of Remote Services (T1210) with moderate to high confidence (80%), supported by evidence indicating lateral movement in government, defense, finance sectors. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (70%), supported by evidence indicating potential data exfiltration (sensitivity not specified). Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating outbound C2 connections from SharePoint servers. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Microsoft_SharePoint Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/microsoft_sharepoint/incident/MIC1790584378
- Microsoft_SharePoint CyberSecurity Rating page: https://www.rankiteo.com/company/microsoft_sharepoint
- Microsoft_SharePoint Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/mic1790584378-microsoft-vulnerability-august-2026/
- Microsoft_SharePoint CyberSecurity Score History: https://www.rankiteo.com/company/microsoft_sharepoint/history
- Microsoft_SharePoint CyberSecurity Incident Source: https://www.rescana.com/post/microsoft-sharepoint-server-cve-2026-65660-actively-exploited-critical-rce-vulnerability-threatens-unpatched-systems
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf