Incident Score: Analysis & Impact (MIC1782296659)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Microsoft Security'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 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 breach identified under incident ID MIC1782296659.
The analysis begins with a detailed overview of Microsoft Security's information like the linkedin page: https://www.linkedin.com/company/microsoft-security, the number of followers: 579191, 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 and their customers.
On 09 June 2026, Microsoft Exchange Server disclosed SSRF (Server-Side Request Forgery) issues under the banner "Microsoft Exchange SSRF Vulnerability (CVE-2026-45502) Exploit Released".
A proof-of-concept (PoC) exploit has been published for CVE-2026-45502, a server-side request forgery (SSRF) vulnerability in Microsoft Exchange Server’s Exchange Web Services (EWS).
The disruption is felt across the environment, affecting Microsoft Exchange Server 2016 (CU23), 2019 (CU14, CU15), Subscription Edition (RTM).
In response, moved swiftly to contain the threat with measures like Patch deployment (KB5094139), restrict outbound connectivity from Exchange servers, and began remediation that includes Microsoft patched the vulnerability in June 2026 Patch Tuesday (KB5094139), replacing flawed logic with a feature-flag-driven model and introducing ManifestUrlCheck allowlist.
The case underscores how teams are taking away lessons such as Insufficient URL validation in Exchange Web Services can lead to SSRF vulnerabilities, enabling internal reconnaissance. Strict access controls and outbound connectivity restrictions are critical for mitigation, and recommending next steps like Apply Microsoft’s June 2026 Patch Tuesday update (KB5094139) immediately, Restrict outbound connectivity from Exchange servers and Monitor for anomalous HTTP traffic.
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 moderate confidence (60%), supported by evidence indicating sSRF vulnerability in Microsoft Exchange Server’s Exchange Web Services (EWS) and Valid Accounts (T1078) with high confidence (90%), supported by evidence indicating authenticated mailbox users to manipulate the ManifestUrl parameter. Under the Execution tactic, the analysis identified Native API (T1106) with moderate to high confidence (70%), supported by evidence indicating synchronousDownloadData.DownloadDataFromUri() function processes user-supplied ManifestUrl. Under the Credential Access tactic, the analysis identified Container API (T1552.007) with moderate confidence (50%), supported by evidence indicating access to internal HTTP services, metadata endpoints (e.g., 169.254.169.254). Under the Discovery tactic, the analysis identified Network Service Discovery (T1046) with moderate to high confidence (80%), supported by evidence indicating hTTP error codes and timing can be used for internal reconnaissance. Under the Lateral Movement tactic, the analysis identified Account Discovery: Domain Account (T1087.002) with moderate confidence (60%), supported by evidence indicating exchange server can be used as a network proxy for internal reconnaissance. Under the Command and Control tactic, the analysis identified Proxy (T1090) with high confidence (90%), supported by evidence indicating exchange server to send HTTP requests to attacker-controlled internal or external endpoints. Under the Defense Evasion tactic, the analysis identified Install Root Certificate (T1553.004) with lower confidence (40%), supported by evidence indicating manifestUrl parameter in InstallApp SOAP request to bypass validation. 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 Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/microsoft-security/incident/MIC1782296659
- Microsoft Security CyberSecurity Rating page: https://www.rankiteo.com/company/microsoft-security
- Microsoft Security Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/mic1782296659-microsoft-vulnerability-june-2026/
- Microsoft Security CyberSecurity Score History: https://www.rankiteo.com/company/microsoft-security/history
- Microsoft Security CyberSecurity Incident Source: https://gbhackers.com/poc-released-for-microsoft-exchange-server-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