Incident Score: Analysis & Impact (ONCTRI1779733617)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of The Oncology Institute's Breach 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 The Oncology Institute 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 The Oncology Institute breach identified under incident ID ONCTRI1779733617.
The analysis begins with a detailed overview of The Oncology Institute's information like the linkedin page: https://www.linkedin.com/company/oncologyinstitute, the number of followers: 8450, the industry type: Medical Practices and the number of employees: 488 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 705 and after the incident was 637 with a difference of -68 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 The Oncology Institute and their customers.
On 20 May 2026, The Oncology Institute (TOI) disclosed Data Breach issues under the banner "Cybersecurity Incident at The Oncology Institute Exposing Patient Data".
The Oncology Institute (TOI) confirmed that a cybersecurity incident resulted in unauthorized access to patient information.
The disruption is felt across the environment, and exposing Patient information.
In response, and stakeholders are being briefed through SEC filing, patient portal for inquiries.
The case underscores how Ongoing, with advisories going out to stakeholders covering Patient portal for inquiries.
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 Supply Chain Compromise (T1195) with high confidence (90%), with evidence including breach originated from a third-party software vendor, and third-party vendor compromise and Compromise Software Supply Chain (T1195.002) with moderate to high confidence (80%), supported by evidence indicating triZetto Provider Solutions (Cognizant-owned) likely source. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate to high confidence (70%), supported by evidence indicating unauthorized access to TOI’s systems via third-party vendor. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating patient information was compromised via vendor systems. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating unauthorized access to patient data, likely exfiltrated and Transfer Data to Cloud Account (T1537) with moderate confidence (60%), supported by evidence indicating vendor established a patient portal for disclosures. Under the Impact tactic, the analysis identified Defacement (T1491) with moderate confidence (50%), supported by evidence indicating patient portal established for breach disclosures and Data Manipulation: Transmitted Data Manipulation (T1565.002) with lower confidence (40%), supported by evidence indicating unauthorized access to patient data, potential manipulation. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- The Oncology Institute Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/oncologyinstitute/incident/ONCTRI1779733617
- The Oncology Institute CyberSecurity Rating page: https://www.rankiteo.com/company/oncologyinstitute
- The Oncology Institute Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/onctri1779733617-trizetto-provider-solutions-the-oncology-institute-breach-may-2026/
- The Oncology Institute CyberSecurity Score History: https://www.rankiteo.com/company/oncologyinstitute/history
- The Oncology Institute CyberSecurity Incident Source: https://www.securityweek.com/oncology-institute-discloses-third-party-data-breach/
- 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