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Analysis, product insight, and practical reads for builders

Threat actors are actively exploiting three newly disclosed Windows zero-days—BlueHammer, RedSun, and UnDefend—to gain SYSTEM or elevated privileges and to block Defender updates. BlueHammer has been patched in the April 2026 updates (CVE-2026-33825), but RedSun and UnDefend remain unpatched, enabling attacks on Windows 10/11 and Windows Server 2019+ even with Defender enabled. Security researchers have observed all three exploits in the wild since early April, including an instance via a compromised SSLVPN session, indicating hands-on-keyboard activity and foreshadowing a wave of further exploits.

CISA warns that the high-severity CVE-2026-34197 flaw in Apache ActiveMQ is now actively exploited in attacks. The vulnerability enables remote code execution through improper input validation and was patched on March 30 for ActiveMQ Classic 6.2.3 and 5.19.4; ShadowServer reports over 7,500 exposed servers. CISA added CVE-2026-34197 to the Known Exploited Vulnerabilities catalog and ordered federal agencies to patch by April 30 under BOD 22-01, while PRIVATE sector defenders are urged to apply mitigations for CVE-2026-35616 and monitor logs for suspicious broker activity; this follows prior ActiveMQ exploits CVE-2023-46604 and CVE-2016-3088.

BleepingComputer is hosting a live webinar on May 14, 2026 at 2:00 PM ET with Kaseya to explain why MSPs must rethink both security and recovery, highlighting how AI-powered phishing, BEC, and ransomware challenge traditional defenses and how integrating SaaS backups and disaster recovery with prevention and detection can minimize downtime and strengthen cyber resilience.

Flare’s analysis reveals an underground guide that treats vetting stolen credit card shops as the core skill, showing threat actors moving from opportunistic fraud to structured supplier verification. Survival and data freshness define legitimacy, with emphasis on fresh BIN data and low decline rates, multiple data sources, and controlled forums for validation. The guide covers technical checks (domain age, SSL, mirror domains) and operational security (proxying, crypto choices, multi-point access). It also notes potential bias and highlights defensive value by monitoring these markets for early fraud indicators.
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