Marsh McLennan
Company Details
Linkedin ID:
marshmclennan
Website:
Employees number:
67,727
Number of followers:
810,970
NAICS:
52
Industry Type:
Homepage:
marshmclennan.com
IP Addresses:
526
Company ID:
MAR_2333270
Scan Status:
Completed
Marsh McLennan Company CyberSecurity Posture
marshmclennan.com
Marsh McLennan (NYSE: MMC) is a global leader in risk, strategy and people, advising clients in 130 countries across four businesses: Marsh, Guy Carpenter, Mercer and Oliver Wyman. With annual revenue of $23 billion and more than 85,000 colleagues, Marsh McLennan helps build the confidence to thrive through the power of perspective. Follow us on X at @MarshMcLennan.
Marsh McLennan A.I CyberSecurity Scoring
Marsh McLennan Risk Score (AI oriented)Between 800 and 849
Marsh McLennan
Updated:
- Powered by our proprietary A.I cyber incident model
- Insurance preferes TPRM score to calculate premium
Marsh McLennan Global Score (TPRM)XXXX
Marsh McLennan
- Instant access to detailed risk factors
- Benchmark vs. industry & size peers
- Vulnerabilities
- Findings
Marsh McLennan Company CyberSecurity News & History
Past Incidents
2
Attack Types
2
Marsh & McLennan Companies, Inc.
Breach
Rankiteo Explanation
Attack with significant impact with internal employee data leaks
Description: The California Office of the Attorney General reported a data breach involving Kroll Background Screening Services, a subsidiary of Marsh & McLennan Companies, Inc. The breach occurred between June 2013 and September 2013, resulting in unauthorized access to personal information, including names and Social Security Numbers. The breach notification was reported on November 26, 2013.
Marsh McLennan
Data Leak
Rankiteo Explanation
Attack limited on finance or reputation
Description: Marsh & McLennan Cos. Inc. was hit by a data breach in April involving access to Social Security numbers and other personal information of staff, former staff, clients and a range of other people linked to the brokerage. Marsh McLennan notified that the breach involved a limited set of data and it reset system access rights and imposed additional restrictions. The information involved included names, Social Security numbers or other federal tax identification numbers. The company offered complimentary credit monitoring for two years, identity theft detection and resolution services and up to $1 million in identity theft insurance coverage.
Marsh McLennan Company Scoring based on AI Models
Cyber Incidents Likelihood 3 - 6 - 9 months
A.I Risk Score Likelihood 3 - 6 - 9 months
Underwriter Stats for Marsh McLennan
Incidents vs Financial Services Industry Average (This Year)
No incidents recorded for Marsh McLennan in 2025.
Incidents vs All-Companies Average (This Year)
No incidents recorded for Marsh McLennan in 2025.
Incident Types Marsh McLennan vs Financial Services Industry Avg (This Year)
No incidents recorded for Marsh McLennan in 2025.
Incident History — Marsh McLennan (X = Date, Y = Severity)
Marsh McLennan cyber incidents detection timeline including parent company and subsidiaries
Marsh McLennan Company Subsidiaries
Marsh McLennan (NYSE: MMC) is a global leader in risk, strategy and people, advising clients in 130 countries across four businesses: Marsh, Guy Carpenter, Mercer and Oliver Wyman. With annual revenue of $23 billion and more than 85,000 colleagues, Marsh McLennan helps build the confidence to thrive through the power of perspective. Follow us on X at @MarshMcLennan.
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Marsh McLennan CyberSecurity News
November 09, 2025 08:00 AM
Ransomware Surge Poses Geopolitical and Economic Risks, Warns Joint Cybersecurity Report
A new joint report released this week by Northwave Cyber Security and Marsh, a division of Marsh McLennan, warns that ransomware attacks...
October 30, 2025 07:00 AM
Ransomware, hackers targeting Israeli small businesses
Ransomware attackers have shifted to 'softer' targets in their attempts at disrupting Israeli and Western economies and national security...
October 27, 2025 05:24 PM
Hong Kong Cybersecurity Law
Ahead of the new cyber law in 2026, firms must be compliant to avoid potential fines and reputational damage.
September 30, 2025 07:00 AM
Risk in Context Podcast: Strengthening resilience through effective cyber threat management
In this episode our hosts discuss the importance of reviewing and reinforcing cyber controls to help minimize cyber exposures and...
September 01, 2025 07:00 AM
Incident response, MFA, and EDR rank as top controls in Marsh McLennan’s latest cyber risk study
Marsh McLennan, through its Cyber Risk Intelligence Center, examines which cybersecurity measures actually reduce risk and pushes the...
September 01, 2025 07:00 AM
Cybersecurity signals: Connecting controls and incident outcomes
Cybersecurity signals research highlights the controls that most reduce breach risk and shows why deployment quality is key to outcomes.
August 28, 2025 07:00 AM
Incident response planning linked to fewer cyber insurance claims: Marsh
Organizations that regularly test their cyber incident response plans are significantly less likely to face breach-related insurance claims,...
August 28, 2025 07:00 AM
Cyber incident response planning a key control in reducing cyber risk: Marsh
Cyber incident response planning has emerged as a key cybersecurity control in reducing the likelihood of a breach-related claim,...
August 27, 2025 07:00 AM
Cybersecurity signals: Connecting controls and incident outcomes
This study analyzes data and explores which cybersecurity controls are most effective at reducing risk.
Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
Marsh McLennan CyberSecurity History Information
Official Website of Marsh McLennan
The official website of Marsh McLennan is https://www.marshmclennan.com/.
Marsh McLennan’s AI-Generated Cybersecurity Score
According to Rankiteo, Marsh McLennan’s AI-generated cybersecurity score is 808, reflecting their Good security posture.
How many security badges does Marsh McLennan’ have ?
According to Rankiteo, Marsh McLennan currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
Does Marsh McLennan have SOC 2 Type 1 certification ?
According to Rankiteo, Marsh McLennan is not certified under SOC 2 Type 1.
Does Marsh McLennan have SOC 2 Type 2 certification ?
According to Rankiteo, Marsh McLennan does not hold a SOC 2 Type 2 certification.
Does Marsh McLennan comply with GDPR ?
According to Rankiteo, Marsh McLennan is not listed as GDPR compliant.
Does Marsh McLennan have PCI DSS certification ?
According to Rankiteo, Marsh McLennan does not currently maintain PCI DSS compliance.
Does Marsh McLennan comply with HIPAA ?
According to Rankiteo, Marsh McLennan is not compliant with HIPAA regulations.
Does Marsh McLennan have ISO 27001 certification ?
According to Rankiteo,Marsh McLennan is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Industry Classification of Marsh McLennan
Marsh McLennan operates primarily in the Financial Services industry.
Number of Employees at Marsh McLennan
Marsh McLennan employs approximately 67,727 people worldwide.
Subsidiaries Owned by Marsh McLennan
Marsh McLennan presently has no subsidiaries across any sectors.
Marsh McLennan’s LinkedIn Followers
Marsh McLennan’s official LinkedIn profile has approximately 810,970 followers.
NAICS Classification of Marsh McLennan
Marsh McLennan is classified under the NAICS code 52, which corresponds to Finance and Insurance.
Marsh McLennan’s Presence on Crunchbase
No, Marsh McLennan does not have a profile on Crunchbase.
Marsh McLennan’s Presence on LinkedIn
Yes, Marsh McLennan maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/marshmclennan.
Cybersecurity Incidents Involving Marsh McLennan
As of December 11, 2025, Rankiteo reports that Marsh McLennan has experienced 2 cybersecurity incidents.
Number of Peer and Competitor Companies
Marsh McLennan has an estimated 30,346 peer or competitor companies worldwide.
What types of cybersecurity incidents have occurred at Marsh McLennan ?
Incident Types: The types of cybersecurity incidents that have occurred include Breach and Data Leak.
How does Marsh McLennan detect and respond to cybersecurity incidents ?
Detection and Response: The company detects and responds to cybersecurity incidents through an containment measures with reset system access rights, containment measures with imposed additional restrictions..
Incident Details
Can you provide details on each incident ?
Title: Marsh & McLennan Data Breach
Description: Marsh & McLennan Cos. Inc. was hit by a data breach in April involving access to Social Security numbers and other personal information of staff, former staff, clients, and a range of other people linked to the brokerage.
Date Detected: April 2023
Type: Data Breach
Title: Marsh & McLennan Companies, Inc. Data Breach
Description: Unauthorized access to personal information, including names and Social Security Numbers, through Kroll Background Screening Services.
Date Detected: 2013-09
Date Publicly Disclosed: 2013-11-26
Type: Data Breach
Attack Vector: Unauthorized Access
What are the most common types of attacks the company has faced ?
Common Attack Types: The most common types of attacks the company has faced is Breach.
Impact of the Incidents
What was the impact of each incident ?
Incident : Data Breach MAR18242223
Data Compromised: Social security numbers, Federal tax identification numbers, Names
Identity Theft Risk: True
Incident : Data Breach MAR307072525
Data Compromised: Names, Social security numbers
What types of data are most commonly compromised in incidents ?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Social Security Numbers, Federal Tax Identification Numbers, Names, , Names, Social Security Numbers and .
Which entities were affected by each incident ?
Incident : Data Breach MAR18242223
Entity Name: Marsh & McLennan Cos. Inc.
Entity Type: Company
Industry: Brokerage
Incident : Data Breach MAR307072525
Entity Name: Marsh & McLennan Companies, Inc.
Entity Type: Corporation
Industry: Professional Services
Response to the Incidents
What measures were taken in response to each incident ?
Incident : Data Breach MAR18242223
Containment Measures: Reset system access rightsImposed additional restrictions
Data Breach Information
What type of data was compromised in each breach ?
Incident : Data Breach MAR18242223
Type of Data Compromised: Social security numbers, Federal tax identification numbers, Names
Sensitivity of Data: High
Incident : Data Breach MAR307072525
Type of Data Compromised: Names, Social security numbers
Sensitivity of Data: High
How does the company handle incidents involving personally identifiable information (PII) ?
Handling of PII Incidents: The company handles incidents involving personally identifiable information (PII) through by reset system access rights, imposed additional restrictions and .
References
Where can I find more information about each incident ?
Incident : Data Breach MAR18242223
Source: Marsh & McLennan Cos. Inc.
Incident : Data Breach MAR307072525
Source: California Office of the Attorney General
Date Accessed: 2013-11-26
Where can stakeholders find additional resources on cybersecurity best practices ?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Marsh & McLennan Cos. Inc., and Source: California Office of the Attorney GeneralDate Accessed: 2013-11-26.
Stakeholder and Customer Advisories
Were there any advisories issued to stakeholders or customers for each incident ?
Incident : Data Breach MAR18242223
Customer Advisories: Complimentary credit monitoring for two yearsIdentity theft detection and resolution servicesUp to $1 million in identity theft insurance coverage
What advisories does the company provide to stakeholders and customers following an incident ?
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Complimentary Credit Monitoring For Two Years, Identity Theft Detection And Resolution Services, Up To $1 Million In Identity Theft Insurance Coverage and .
Additional Questions
Incident Details
What was the most recent incident detected ?
Most Recent Incident Detected: The most recent incident detected was on April 2023.
What was the most recent incident publicly disclosed ?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2013-11-26.
Impact of the Incidents
What was the most significant data compromised in an incident ?
Most Significant Data Compromised: The most significant data compromised in an incident were Social Security numbers, Federal tax identification numbers, Names, , Names, Social Security Numbers and .
Response to the Incidents
What containment measures were taken in the most recent incident ?
Containment Measures in Most Recent Incident: The containment measures taken in the most recent incident was Reset system access rightsImposed additional restrictions.
Data Breach Information
What was the most sensitive data compromised in a breach ?
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Social Security numbers, Names, Social Security Numbers and Federal tax identification numbers.
References
What is the most recent source of information about an incident ?
Most Recent Source: The most recent source of information about an incident are Marsh & McLennan Cos. Inc. and California Office of the Attorney General.
Stakeholder and Customer Advisories
What was the most recent customer advisory issued ?
Most Recent Customer Advisory: The most recent customer advisory issued was an Complimentary credit monitoring for two yearsIdentity theft detection and resolution servicesUp to $1 million in identity theft insurance coverage.
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Latest Global CVEs (Not Company-Specific)
Description
FreePBX Endpoint Manager is a module for managing telephony endpoints in FreePBX systems. Versions prior to 16.0.96 and 17.0.1 through 17.0.9 have a weak default password. By default, this is a 6 digit numeric value which can be brute forced. (This is the app_password parameter). Depending on local configuration, this password could be the extension, voicemail, user manager, DPMA or EPM phone admin password. This issue is fixed in versions 16.0.96 and 17.0.10.
Risk Information
cvss4
Base: 6.9
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Neuron is a PHP framework for creating and orchestrating AI Agents. In versions 2.8.11 and below, the MySQLWriteTool executes arbitrary SQL provided by the caller using PDO::prepare() + execute() without semantic restrictions. This is consistent with the name (“write tool”), but in an LLM/agent context it becomes a high-risk capability: prompt injection or indirect prompt manipulation can cause execution of destructive queries such as DROP TABLE, TRUNCATE, DELETE, ALTER, or privilege-related statements (subject to DB permissions). Deployments that expose an agent with MySQLWriteTool enabled to untrusted input and/or run the tool with a DB user that has broad privileges are impacted. This issue is fixed in version 2.8.12.
Risk Information
cvss3
Base: 9.4
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Description
Neuron is a PHP framework for creating and orchestrating AI Agents. Versions 2.8.11 and below use MySQLSelectTool, which is vulnerable to Read-Only Bypass. MySQLSelectTool is intended to be a read-only SQL tool (e.g., for LLM agent querying, however, validation based on the first keyword (e.g., SELECT) and a forbidden-keyword list does not block file-writing constructs such as INTO OUTFILE / INTO DUMPFILE. As a result, an attacker who can influence the tool input (e.g., via prompt injection through a public agent endpoint) may write arbitrary files to the DB server if the MySQL/MariaDB account has the FILE privilege and server configuration permits writes to a useful location (e.g., a web-accessible directory). This issue is fixed in version 2.8.12.
Risk Information
cvss3
Base: 8.2
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Description
Okta Java Management SDK facilitates interactions with the Okta management API. In versions 11.0.0 through 20.0.0, race conditions may arise from concurrent requests using the ApiClient class. This could cause a status code or response header from one request’s response to influence another request’s response. This issue is fixed in version 20.0.1.
Risk Information
cvss3
Base: 8.4
Severity: HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Description
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. When using versions 4.11.0 through 4.11.2 and 4.12.0, simultaneous requests on the same client may result in improper lookups in the TokenRequestCache for the request results. This issue is fixed in versions 4.11.2 and 4.12.1.
Risk Information
cvss3
Base: 5.4
Severity: HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
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RapidWhat Do We Measure ?
Incident
Finding
Grade
Digital Assets
Every week, Rankiteo analyzes billions of signals to give organizations a sharper, faster view of emerging risks. With deeper, more actionable intelligence at their fingertips, security teams can outpace threat actors, respond instantly to Zero-Day attacks, and dramatically shrink their risk exposure window.
These are some of the factors we use to calculate the overall score:
Network Security
Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.
SBOM (Software Bill of Materials)
Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.
CMDB (Configuration Management Database)
Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Threat Intelligence
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
Rankiteo is a unified scoring and risk platform that analyzes billions of signals weekly to help organizations gain faster, more actionable insights into emerging threats. Empowering teams to outpace adversaries and reduce exposure.
