Cybersecurity Firms Impacted by Klue Supply Chain Attack

Cybersecurity firms Huntress and Recorded Future have disclosed the impact of a supply chain attack that hit market intelligence platform Klue. The attack started on June 11 and affected systems associated with software platform integrations. The hackers connected to Klue’s backend servers and executed unauthorized commands, pushing a code update to harvest OAuth tokens for customers’ Klue integrations. Klue notified customers of the incident on June 12, warning that it had deactivated OAuth tokens for all customers and disabled integrations with Salesforce, HubSpot, SharePoint, Zoom, Gong, Chorus, Clari, Google Drive, and Slack. According to ReliaQuest, the hackers abused the Salesforce REST API to exfiltrate large volumes of customer relationship management (CRM) data over a 24-hour window, “including a concentrated burst of nearly a thousand queries in 15 minutes and sustained extraction windows lasting over 6 hours”. On June 17, Salesforce disabled the Klue Battlecards app integration, warning that it “detected unusual activity involving the app that may have resulted in unauthorized access to a subset of customer data via the app’s connection to Salesforce”. On Thursday, both Huntress and Recorded Future confirmed that they were among the companies affected by the supply chain attack. “The data that was copied from our Salesforce account includes business contacts, price quotes, and other sales-related data and messaging. No threat data, passwords, payment card information, or engineering data relating to the Huntress agent or telemetry we collect was affected,” Huntress said. Recorded Future noted, “While our investigation is ongoing, we believe the impact was limited to business data fields stored in our Salesforce database, such as client contact names and email addresses. Certain business contract information may also have been potentially included in the impacted data.” The incident was limited to the Klue-Salesforce integration and the attackers did not access any systems belonging to or maintained by the two cybersecurity firms. Huntress noted that several other cybersecurity companies use Klue, but no other firm appears to have publicly disclosed impact from the attack. The attack follows the same pattern observed in previous Salesforce, Salesloft Drift, and Gainsight incidents, which have been attributed to ShinyHunters and UNC6395, but appears to have been mounted by a new threat actor. Huntress said it received attempted extortion communication from a threat actor calling itself “Mr Brean”, who pointed to a Session Messenger ID associated with Icarus, an extortion group that emerged in April 2026. Icarus’ leak site has one entry from early May, with the data allegedly stolen from the victim already published (albeit no longer available), and another from June 16, which points to data stolen from Salesforce. “With those matching data points, we have high confidence that the Icarus actor is responsible for the Klue compromise and this supply chain attack,” Huntress says. While it has shared details of the attack with its customers, Klue has not made a public announcement on the matter. SecurityWeek has emailed the company for a statement and will update this article if it responds. Related: Atomic Arch Supply Chain Attack Hits 1,500 AUR Packages Related: Over 100 NPM, PyPI Packages Hit in New Shai-Hulud Supply Chain Attacks Related: Maine Disables Data Breach Portal Due to Fake Submissions Related: White House Issues Memo to Bolster NSS Cybersecurity WRITTEN BY Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. 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