Klue Supply Chain Breach Exposes OAuth Tokens and Salesforce Data
The market intelligence platform Klue experienced a supply chain breach where attackers compromised backend servers and pushed malicious code to harvest OAuth tokens from customer integrations. This led to data exfiltration from connected Salesforce environments of nearly 200 downstream organizations, including major cybersecurity vendors. The threat actor, identified as Icarus, exfiltrated business contacts, price quotes, and sales-related information. Klue became aware of the breach on June 11, 2026, and notified customers on June 12, deactivating all OAuth tokens and disabling integrations. No internal networks of affected firms, threat data, passwords, payment card details, or engineering data were directly compromised. LastPass also reported customer information being leaked due to this breach.
Signal context
First seen: Jun 11, 2026
Last updated: Jun 29, 2026
Status: Public signal
Key points
- Klue's backend servers compromised on June 11, 2026.
- Malicious code harvested OAuth tokens from customer integrations.
- Affected nearly 200 organizations, including cybersecurity vendors like Huntress, Recorded Future, Tanium, and Jamf.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Information
Likely country: Location not provided
Watch internet-facing systems, credential abuse and exploit activity.
- Source type: outside the affected organization
Impact area: Confidentiality
Likely asset: User or customer data
- 26 signals in the same sector
- 90 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
Klue OAuth breach victim list grows as Icarus hackers claim attack - Bleeping Computerhttps://www.bleepingcomputer.com/news/security/klue-oauth-breach-victim-list-grows-as-icarus-hackers-claim-attack/Public source from bleepingcomputer.com.
Cybersecurity Firms Impacted by Klue Supply Chain Attack - SecurityWeekhttps://www.securityweek.com/cybersecurity-firms-impacted-by-klue-supply-chain-attack/Public source from securityweek.com.
Scope of Salesforce Attacks Expands as Icarus Leaks Data - Cyber Recapshttps://cyberrecaps.com/news/cybersecurity-news-june-24-2026/Public source from cyberrecaps.com.
LastPass hit by new data breach - 4 steps you should take now | ZDNEThttps://www.zdnet.com/article/lastpass-new-data-breach-2026-steps-to-take-now/Public source from zdnet.com.
Top 5 Cybersecurity News Stories June 26, 2026 - DIESEChttps://diesec.com/top-5-cybersecurity-news-stories-june-26-2026/Public source from diesec.com.
Salesforce Disables Klue App Integration After OAuth Token Abuse Exposes Customer Datahttps://thehackernews.com/2026/06/salesforce-disables-klue-app.htmlPublic source from thehackernews.com.
Klue Supply Chain Breach Exposes OAuth Tokens and Salesforce Data in Multi-Stage Cybersecurity Incident (June 2026) - Rescanahttps://www.rescana.com/post/klue-supply-chain-breach-exposes-oauth-tokens-and-salesforce-data-in-multi-stage-cybersecurity-incident-june-2026Public source from rescana.com.
Cybersecurity Daily Briefing: June 22, 2026https://techmaniacs.com/cybersecurity-daily-briefing-june-22-2026/Public source from techmaniacs.com.
NEWS ROUNDUP - 22nd June 2026https://digitalforensicsmagazine.com/news-roundup-22nd-june-2026/Public source from digitalforensicsmagazine.com.
Recorded Future (2026-06-11) Cyber-Attack Hack Breach - The Cyber Security Incident Database (CSIDB)https://www.csidb.net/csidb/incidents/a3694fd2-8468-45d3-9044-340ea5ca3d90/Public source from csidb.net.
Related signals
Grouped by why the signal is relevant.
NIFTY Corporation Affected by KDDI Corporation Data Breach
NIFTY Corporation, a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. NIFTY Corporation customers' email addresses and passwords may have been compromised.
BIGLOBE Inc. Affected by KDDI Corporation Data Breach
BIGLOBE Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. BIGLOBE Inc. customers' email addresses and passwords may have been compromised.
STNet, Inc. Affected by KDDI Corporation Data Breach
STNet, Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. STNet customers' email addresses and passwords may have been compromised.
KDDI Web Communications Customer Data Affected by KDDI Email System Breach
KDDI Web Communications, a subsidiary of KDDI, was impacted by the data breach in KDDI Corporation's email system, disclosed on June 28, 2026. The incident, caused by a third-party software vulnerability, led to the potential exposure of up to 14.2 million email addresses and passwords belonging to customers across six Japanese ISPs, including KDDI Web Communications.
JCOM Co., Ltd. Affected by KDDI Corporation Data Breach
JCOM Co., Ltd., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. JCOM customers' email addresses and passwords may have been compromised.
Polymarket Suffers $3 Million Crypto Drain via Third-Party Vendor Compromise
Prediction market platform Polymarket disclosed a breach where hackers compromised a third-party vendor. The attackers injected malicious code into the Polymarket website for some users, leading to the draining of approximately $3 million in pUSD (USDC-backed) from at least 11 user wallets. The stolen funds were subsequently swapped and moved to Ethereum. Polymarket has contained the incident, committed to full refunds for affected users, and is in the process of notifying victims. This incident highlights supply-chain vulnerabilities in web frontends and crypto platforms.