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Cyber security news, as it breaks.
Updated 103 stories in 24 hours
Malware & Exploits
Malware, exploited flaws, phishing and botnets, from the researchers who found them.
121stories this week
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Most fromThe Hacker News, SecurityWeek, BleepingComputer, Help Net Security
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Threat actors have weaponized a now-patched security flaw in Zimbra Collaboration Suite (ZCS) to deploy web shells and access mailbox data, according to findings from the Microsoft Security Research team. The attack exploits CVE-2026-73570 (CVSS score: 8.9), an unauthenticated operating system command injection flaw that can lead to remote code execution when Simple Network Management…
The Hacker News
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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is warning of a new critical vulnerability in MikroTik RouterOS that could lead to remote code execution or cause a denial-of-service condition.
BleepingComputer
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Suspected state-linked actors targeted critical vulnerabilities in the widely used platform, causing widespread disruption across Europe and North America.
Cybersecurity Dive
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Attackers are exploiting a new critical zero-day flaw in Cisco Catalyst SD-WAN Manager, the system companies use to manage their Cisco SD-WAN networks, Cisco said in an advisory on September 30. The flaw, CVE-2026-76504, could allow a remote attacker with no login access to use the Manager’s API as the admin user. Fixed releases are…
The Hacker News
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Threat actors are abusing ChatGPT Custom GPTs to disguise them as legitimate product offerings and direct unsuspecting victims to malicious sites that employ ClickFix lures to deliver malware. Huntress, which observed the activity in late September 2026, said it marks the abuse of yet another feature in trusted artificial intelligence (AI) platforms. Prior campaigns have…
The Hacker News
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Cisco released security updates to address a critical zero-day in the Catalyst SD-WAN Manager (tracked as CVE-2026-76504) that attackers are actively exploiting to escalate to admin privileges.
BleepingComputer
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Google’s analysis found that AI-discovered vulnerabilities are more likely to enable remote code execution.
SecurityWeek
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Microsoft Threat Intelligence examines CVE-2026-73570 exploitation in Zimbra, including observed attack paths, detection opportunities, and mitigation guidance.
Microsoft
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Written by: Robin Grunewald, Supriya Mazumdar, Kelli Vanderlee Introduction Google Threat Intelligence Group (GTIG) examines vulnerability disclosure and exploitation statistics to evaluate the impact of artificial intelligence (AI) on the vulnerability threat landscape. We found that AI is measurably changing not just the pace of vulnerability discovery and exploitation, but also the types and typical…
Google Threat Intelligence
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WatchGuard has rolled out patches for 15 code execution, DoS, authorization, and path traversal bugs in Fireware OS.
SecurityWeek
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Remote access software company TeamViewer warned customers on Tuesday to immediately patch a set of high-severity vulnerabilities affecting its client and host software.
BleepingComputer
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Some of the flaws could allow remote attackers to execute arbitrary code or escape the browser sandbox.
SecurityWeek
