medium severity June 18, 2026 · 3 min read Unverified claim — what this is

Icarus Group Steals Salesforce Data via Klue OAuth Breach

If you are a customer of Huntress, here’s what is being claimed, and what it would mean for you.

Threat actor group Icarus exploited an OAuth breach in the Klue Battlecards app to access and exfiltrate Salesforce CRM data from multiple customer organizations, including cybersecurity firm Huntress. Stolen information includes business contacts, sales communications, price quotes, and competitive intelligence. The campaign represents an ongoing supply-chain style attack on Salesforce integrations.
— from Icarus’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

Icarus Group Steals Salesforce Data via Klue OAuth Breach

A threat actor group known as Icarus stole Salesforce customer data by exploiting an OAuth vulnerability in the Klue Battlecards application, gaining access to business contacts, sales records, communications, price quotes, and competitive intelligence from multiple organizations, including the cybersecurity company Huntress.

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Supply-Chain Attack on Klue

Public reporting from BleepingComputer and Dark Reading confirms the incident occurred through a supply-chain attack on the Klue app, which integrates with Salesforce CRM platforms. The attackers used compromised OAuth tokens to exfiltrate data without directly breaching Salesforce itself. Affected organizations remain undisclosed in full, and the precise number of individuals whose contact or sales information was taken is unknown. The campaign is described as ongoing, highlighting how third-party integrations can serve as entry points for broader data theft.

Personal Data Exposed

this claimed breach matters to you and your family because sales and contact data often include personal phone numbers, email addresses, home addresses, and employer details that can be repurposed for identity theft or targeted scams. When your professional information leaks, it frequently connects to personal accounts through shared passwords, recovery emails, or familiar security questions. Children’s information can also surface indirectly when family members share the same email domain or when parental work contacts reveal household details.

Doxxing and Identity Risks

The doxxing and identity-chain implications are significant. Stolen business contacts can be cross-referenced with social media handles, gaming usernames, or family member profiles to build a complete picture of your household. A single leaked work email can lead to password resets on personal services, while sales communications may contain enough context to impersonate you or your colleagues. Credential leaks of this nature often cascade into account takeovers, especially for gaming platforms where children use family emails or shared passwords, turning a business breach into a personal doxxing chain that exposes addresses, phone numbers, and relationships across the internet.

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value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

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Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Icarus · 11 incidents tracked →

Severity Medium contact details only, none of them permanent

Disclosed June 18, 2026

Last reviewed August 8, 2026

Affected Unconfirmed

Data exposed salesforce databusiness contactssales records

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Icarus — 11 incidents tracked

Every breach we've attributed to Icarus, in one running log. See who else they've hit →

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