Klue Breach: What You Need to Know

## Executive summary The Klue breach involved unauthorized activity in Klue’s integration infrastructure beginning on June 11–12, 2026, where attackers used a compromised legacy credential and a malicious code change to harvest OAuth tokens and access Salesforce CRM data of multiple customers; impacted organizations reported exposure of contacts, account and opportunity records, pricing and support metadata, and subsequent extortion attempts. Klue revoked credentials, removed unauthorized code, disabled integrations and engaged investigators; recommended defensive actions include revoking OAuth tokens, reviewing connected-app permissions, searching for anomalous API activity, rotating adjacent credentials, and preparing for phishing/extortion follow-on abuse.