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StealC Malware Control Panel Flaw Exposes Attacker Details

First seen 19 Jan 2026, 18:31 UTC • •

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ThreatCluster •March 12, 2026 at 13:27 UTC

Researchers identified an XSS vulnerability in the control panel of StealC malware, which has been operational since at least 2023. This infostealer, sold as Malware-as-a-Service, allows attackers to steal sensitive information like cookies and passwords. The flaw has led to the exposure of key details about the threat actor behind the malware.

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