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Home » Salesforce Customers Alarmed by Major Third-Party Data Breach
Cybercrime and Ransomware

Salesforce Customers Alarmed by Major Third-Party Data Breach

Staff WriterBy Staff WriterNovember 21, 2025No Comments4 Mins Read0 Views
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Summary Points

  1. Salesforce detected a security breach involving third-party vendor Gainsight, impacting over 200 instances and linked to cybercriminals possibly from the ShinyHunters or UNC6240 groups.
  2. The breach appears to be similar to a recent attack on Salesloft Drift, with both attacks authoring through compromised third-party integrations, leading Salesforce to revoke related access tokens.
  3. Gainsight’s app was temporarily removed from the HubSpot Marketplace as a precaution; the breach may have potentially affected other connected services beyond Salesforce.
  4. The incident is linked to a broader supply-chain attack where malicious actors gained access to Salesloft’s GitHub in March, leading to data theft from hundreds during August, and gains insight into persistent threat groups targeting such integrations.

The Issue

Recently, Salesforce identified a security breach involving a third-party vendor, Gainsight, which resulted in unauthorized access to customer data within Salesforce ecosystems. The breach was detected through unusual activity in Gainsight-connected applications linked to Salesforce, affecting over 200 instances, according to Google Threat Intelligence Group. This incident echoes a prior widespread attack over two months ago, linked to the same cybercriminal groups—likely ShinyHunters or UNC6240—that compromised more than 700 customers by exploiting integrations with platforms like Salesloft and Drift. Salesforce responded swiftly by revoking access tokens used to connect these third-party services, but the company did not disclose exactly when it discovered the breach or the full extent of the damage, though it confirmed the activity was related to external app connections, not a flaw within Salesforce itself. Gainsight, which serves about 1,000 enterprise clients, has suspended its app on the Hubspot Marketplace as a precaution, and both Gainsight and Salesforce are investigating the incident. The attack appears to have stemmed from threat actors gaining prolonged access to third-party accounts, suggesting that the breach could have potentially compromised any service linked to Gainsight or similar platforms, with the full scope still uncertain.

Risks Involved

The recent breach affecting hundreds of Salesforce customers due to a third-party vendor incident underscores a critical vulnerability that any business relying on external platforms faces; if your business depends on cloud-based services or third-party integrations, a similar breach could expose sensitive customer data, disrupt operations, erode trust, and lead to significant financial and reputational damage—highlighting that cybersecurity risks are not just hypothetical but immediate threats that can materialize unexpectedly, threatening your company’s stability and long-term success.

Possible Actions

Prompt response to security breaches is crucial in minimizing damage, restoring trust, and maintaining operational stability—particularly when hundreds of Salesforce customers are affected by a third-party vendor breach, highlighting the vulnerability exposure in interconnected ecosystems.

Containment Strategies:
Immediately isolate compromised systems or accounts to prevent further spread of malicious activity.

Impact Assessment:
Rapidly identify affected data, services, and users to gauge the breach’s scope and severity.

Communication Plan:
Notify all stakeholders—including customers, partners, and regulatory bodies—according to compliance requirements and best practices.

Vendor Coordination:
Engage with the third-party vendor to understand breach details and mitigation efforts, ensuring coordinated action.

Patch & Update:
Apply security patches, update credentials, and fix vulnerabilities exploited in the breach.

Enhanced Monitoring:
Implement heightened monitoring of affected systems for unusual activity and potential further threats.

Remediation & Recovery:
Restore compromised systems with secure configurations, perform thorough testing, and confirm the integrity before bringing them back online.

Lessons & Prevention:
Review existing security policies, conduct risk assessments, and strengthen third-party risk management to prevent future incidents.

Explore More Security Insights

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Access world-class cyber research and guidance from IEEE.

Disclaimer: The information provided may not always be accurate or up to date. Please do your own research, as the cybersecurity landscape evolves rapidly. Intended for secondary references purposes only.

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John Marcelli is a staff writer for the CISO Brief, with a passion for exploring and writing about the ever-evolving world of technology. From emerging trends to in-depth reviews of the latest gadgets, John stays at the forefront of innovation, delivering engaging content that informs and inspires readers. When he's not writing, he enjoys experimenting with new tech tools and diving into the digital landscape.

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