Incident Score: Analysis & Impact (MIC1787733576)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Microsoft Security Response Center'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 Security Response Center 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 Security Response Center breach identified under incident ID MIC1787733576.
The analysis begins with a detailed overview of Microsoft Security Response Center's information like the linkedin page: https://www.linkedin.com/company/microsoft-security-response-center, the number of followers: 75070, the industry type: Computer and Network Security 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 100 and after the incident was 100 with a difference of 0 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 Security Response Center and their customers.
On 11 August 2026, Microsoft SharePoint Server Users disclosed Authentication Bypass and Remote Code Execution issues under the banner "Critical SharePoint Vulnerabilities Enable Unauthenticated Remote Takeover".
Two severe Microsoft SharePoint Server vulnerabilities (CVE-2026-55040 and CVE-2026-63520) can be chained to allow unauthenticated remote attackers to gain full control of unpatched servers.
The disruption is felt across the environment, affecting SharePoint Server Subscription Edition, SharePoint Server 2019, SharePoint Enterprise Server 2016.
In response, moved swiftly to contain the threat with measures like Patching vulnerable systems, and began remediation that includes Microsoft released patches in August 2026.
The case underscores how and recommending next steps like Patch vulnerable SharePoint servers immediately and ensure internet-facing servers are updated.
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 two severe Microsoft SharePoint Server vulnerabilities...can be chained to allow unauthenticated remote attackers and Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating forge unsigned JWTs and impersonate users, including administrators, by knowing only a target’s security identifier. Under the Credential Access tactic, the analysis identified Modify Authentication Process: Multi-Factor Authentication (T1556.003) with high confidence (90%), supported by evidence indicating disabled security checks including the `RequireSignedTokens` setting allowed attackers to forge unsigned JWTs and Brute Force: Password Guessing (T1110.001) with moderate to high confidence (70%), supported by evidence indicating impersonate users...by knowing only a target’s security identifier or principal name (e.g., *user@domain*). Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with high confidence (90%), supported by evidence indicating remote code execution (RCE) vulnerability in SharePoint’s Business Connectivity Services (BCS) and Exploitation of Remote Services (T1210) with high confidence (90%), supported by evidence indicating exploit the `System.Web.UI.LosFormatter` class for deserialization attacks...granting arbitrary code execution. Under the Privilege Escalation tactic, the analysis identified Valid Accounts (T1078) with high confidence (90%), supported by evidence indicating forge unsigned JWTs and impersonate users, including administrators and Exploitation for Privilege Escalation (T1068) with moderate to high confidence (80%), supported by evidence indicating attackers exploit CVE-2026-55040 to bypass authentication, then use forged credentials to upload a malicious BDC model. Under the Defense Evasion tactic, the analysis identified Modify Authentication Process: Multi-Factor Authentication (T1556.003) with high confidence (90%), supported by evidence indicating disabled security checks including the `RequireSignedTokens` setting and Modify Registry (T1112) with moderate confidence (50%), supported by evidence indicating disabled security checks in SharePoint’s JWT handler (implied configuration manipulation). Under the Impact tactic, the analysis identified Resource Hijacking (T1496) with moderate to high confidence (80%), supported by evidence indicating full control of unpatched 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 Security Response Center Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/microsoft-security-response-center/incident/MIC1787733576
- Microsoft Security Response Center CyberSecurity Rating page: https://www.rankiteo.com/company/microsoft-security-response-center
- Microsoft Security Response Center Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/mic1787733576-microsoft-vulnerability-august-2026/
- Microsoft Security Response Center CyberSecurity Score History: https://www.rankiteo.com/company/microsoft-security-response-center/history
- Microsoft Security Response Center CyberSecurity Incident Source: https://cybersecuritynews.com/sharepoint-flaws-chained-to-hack-servers/
- 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