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Questel confirms Microsoft 365 breach after ShinyHunters leaks data

📅 13 August 2026 at 14:54 UTC📰 Cyber InsiderView original source ↗
Questel confirms Microsoft 365 breach after ShinyHunters leaks data

French intellectual property services provider Questel has confirmed that attackers gained unauthorized access to part of its Microsoft 365 environment following a voice phishing attack, and that some of the stolen data was subsequently published online. The company disclosed the incident to CyberInsider after we contacted it regarding a ShinyHunters leak site post claiming the … The post Questel confirms Microsoft 365 breach after ShinyHunters leaks data appeared first on CyberInsider.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Questel experienced unauthorized access to its Microsoft 365 environment following a voice phishing attack, resulting in the theft of sensitive data which was subsequently published online.

⚙️Technical Details
Affected Systems
Sales SharePoint environment in Microsoft 365
Attack Vectors
Voice phishing (vishing)
💥Impact Assessment
Severity: high
Who Is at Risk
Questel customers and corporate users with access to the affected Sales SharePoint environment
🛡️Recommended Actions
1Implement multi-factor authentication for all Microsoft 365 accounts
2Conduct regular security awareness training for employees on voice phishing attacks
3Monitor email and phone communications for suspicious activity
📦Affected Products
Software: Microsoft 365, Salesforce

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