Incident Score: Analysis & Impact (MIC1781541072)
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'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 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 breach identified under incident ID MIC1781541072.
The analysis begins with a detailed overview of Microsoft's information like the linkedin page: https://www.linkedin.com/company/microsoft, the number of followers: 27225811, the industry type: Software Development and the number of employees: 226477 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 662 and after the incident was 661 with a difference of -1 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 and their customers.
Microsoft 365 Copilot Enterprise recently reported "Critical Microsoft 365 Copilot Vulnerability Exposed Sensitive Data via SearchLeak Attack", a noteworthy cybersecurity incident.
A recently patched critical vulnerability in Microsoft 365 Copilot Enterprise, dubbed SearchLeak (CVE-2026-42824), allowed attackers to exfiltrate sensitive data including emails, passwords, calendar events, and SharePoint documents through a malicious URL.
The disruption is felt across the environment, affecting Microsoft 365 Copilot Enterprise, and exposing Emails, passwords, calendar events, SharePoint documents.
In response, moved swiftly to contain the threat with measures like Patch released by Microsoft, and began remediation that includes Fix for CVE-2026-42824.
The case underscores how Resolved (Patched), teams are taking away lessons such as Older vulnerabilities like SSRF and HTML injection become far more dangerous when combined with AI-driven prompt manipulation, creating new attack surfaces in enterprise systems.
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 Phishing: Spearphishing Link (T1566.002) with high confidence (90%), supported by evidence indicating attack required no user interaction beyond clicking a crafted link. Under the Execution tactic, the analysis identified User Execution: Malicious Link (T1204.001) with high confidence (90%), supported by evidence indicating copilot would execute the search upon clicking the crafted link. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Email Addresses (T1552.008) with moderate to high confidence (80%), supported by evidence indicating emails, passwords, calendar events compromised via malicious URL. Under the Collection tactic, the analysis identified Email Collection: Remote Email Collection (T1114.002) with high confidence (90%), supported by evidence indicating exfiltrate sensitive data including emails, SharePoint documents and Data from Information Repositories: SharePoint (T1213.002) with high confidence (90%), supported by evidence indicating sharePoint documents compromised via malicious URL. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating transmit it to the attacker’s server via Bing as unwitting proxy and Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) with moderate to high confidence (70%), supported by evidence indicating bing SSRF bypass leveraged Bing as proxy for data exfiltration. Under the Defense Evasion tactic, the analysis identified Subvert Trust Controls: Install Root Certificate (T1553.004) with moderate confidence (50%), supported by evidence indicating hTML rendering race condition enabled outbound requests before sanitization and Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (60%), supported by evidence indicating bing SSRF bypass to bypass content security policies (CSP). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Microsoft Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/microsoft/incident/MIC1781541072
- Microsoft CyberSecurity Rating page: https://www.rankiteo.com/company/microsoft
- Microsoft Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/mic1781541072-microsoft-vulnerability-june-2026/
- Microsoft CyberSecurity Score History: https://www.rankiteo.com/company/microsoft/history
- Microsoft CyberSecurity Incident Source: https://www.bleepingcomputer.com/news/security/new-attack-turned-microsoft-365-copilot-into-1-click-data-theft-tool/
- 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