Incident Score: Analysis & Impact (MIC1781540872)
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 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 MIC1781540872.
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 405 and after the incident was 391 with a difference of -14 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.
Microsoft 365 Copilot Enterprise recently reported "Microsoft 365 Copilot Vulnerability Chain Exposed in 'SearchLeak' Exploit", a noteworthy cybersecurity incident.
Security researchers at Varonis Threat Labs uncovered a critical vulnerability chain in Microsoft 365 Copilot Enterprise, dubbed SearchLeak (CVE-2026-42824), that enabled attackers to steal sensitive corporate data including MFA codes, emails, calendar details, and confidentia...
The disruption is felt across the environment, affecting Microsoft 365 Copilot Enterprise, and exposing Sensitive corporate data (MFA codes, emails, calendar details, confidential files).
In response, moved swiftly to contain the threat with measures like Microsoft patched the vulnerability server-side, and began remediation that includes Eliminated the need for user intervention; recommended monitoring Copilot Search URLs for encoded payloads, auditing CSP allowlists, and treating AI streaming output as untrusted.
The case underscores how teams are taking away lessons such as AI assistants are creating new attack surfaces by repurposing classic vulnerabilities in novel ways. Security teams should monitor AI-generated URLs, audit CSP allowlists, and treat AI streaming output as untrusted, and recommending next steps like Monitor Copilot Search URLs for encoded payloads in the `q` parameter, Audit CSP allowlists for domains performing server-side fetches on user-supplied URLs and Treat AI streaming output as untrusted and ensure sanitization occurs at render time.
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 User Execution: Malicious Link (T1204.001) with high confidence (90%), supported by evidence indicating one-click attack...with a single click on a seemingly legitimate Microsoft domain link and Drive-by Compromise (T1189) with moderate to high confidence (80%), supported by evidence indicating attackers crafted a malicious URL pointing to a trusted microsoft.com domain. Under the Execution tactic, the analysis identified User Execution: Malicious Link (T1204.001) with high confidence (90%), supported by evidence indicating one-click attack...with a single click on a seemingly legitimate Microsoft domain link and Command and Scripting Interpreter: JavaScript (T1059.007) with moderate to high confidence (70%), supported by evidence indicating hTML rendering race condition...raw HTML including attacker-injected <img> tags. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate to high confidence (80%), supported by evidence indicating enabled attackers to steal sensitive corporate data including MFA codes. Under the Collection tactic, the analysis identified Email Collection: Remote Email Collection (T1114.002) with high confidence (90%), supported by evidence indicating steal sensitive corporate data including...emails, calendar details and Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating confidential files...was exfiltrated via Bing’s image search endpoint. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating exfiltrating data from any Microsoft 365 tenant...via Bing’s image search endpoint and Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) with moderate to high confidence (70%), supported by evidence indicating sSRF via Bing’s image search endpoint...relaying it to the attacker’s server. Under the Defense Evasion tactic, the analysis identified Valid Accounts: Cloud Accounts (T1078.004) with moderate to high confidence (80%), supported by evidence indicating no special privileges or additional user interaction required, Exploit Public-Facing Application (T1190) with high confidence (90%), supported by evidence indicating chained exploit combining...Server-Side Request Forgery (SSRF) via Bing’s image search endpoint, Masquerading: Match Legitimate Name or Location (T1036.005) with high confidence (90%), supported by evidence indicating malicious URL pointing to a trusted microsoft.com domain, and Use Alternate Authentication Material: Application Access Token (T1550.001) with moderate to high confidence (70%), supported by evidence indicating copilot’s AI engine interpreted this as executable commands. 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/MIC1781540872
- 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/mic1781540872-microsoft-vulnerability-june-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/microsoft-365-copilot-one-click-vulnerability/
- 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