StealC malware control panel flaw leaks details on active attacker

Security Affairs

January 19, 2026 at 2:26 PM

Actively Exploited

Overview

Researchers have identified a cross-site scripting (XSS) vulnerability in the control panel of StealC malware, an infostealer that has been operating since at least 2023. This malware, which is sold as a service, targets and extracts sensitive information like cookies and passwords from victims. The flaw in the control panel has exposed important details about the attackers behind the malware, raising concerns about the ongoing threat to users' data security. Since its update to StealC v2 in 2025, the malware has continued to pose risks to individuals and organizations alike. The discovery emphasizes the need for vigilance against such malware, as the information leak could lead to further malicious activities by the attackers.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: StealC malware, control panel of StealC v2
Action Required: Users should ensure their systems are protected with up-to-date security software and remain cautious of suspicious links or downloads.
Timeline: Newly disclosed

Original Article Summary

Researchers uncovered an XSS flaw in StealC malware’s control panel, exposing key details about a threat actor using the info stealer. StealC is an infostealer that has been active since at least 2023, sold as Malware-as-a-Service to steal cookies and passwords. In 2025, its operators released StealC v2, but the web panel quickly leaked and […]

Impact

StealC malware, control panel of StealC v2

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should ensure their systems are protected with up-to-date security software and remain cautious of suspicious links or downloads.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability, Update, Malware, and 1 more.

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