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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 Protocol

Microsoft has warned of phishing campaigns distributing an installer for the MSP360 Remote Monitoring and Management (RMM) software under the guise of meeting invitations, PDF-themed lures, software update prompts, and other social-engineering content. "Once executed, the legitimate MSP360 installer, distributed under a deceptive file name established remote management access on affected

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 available, and there is no workaround. It carries a

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 weaponized shared

Google’s analysis found that AI-discovered vulnerabilities are more likely to enable remote code execution. The post Google: AI Is Changing the Pace and Profile of Vulnerability Discovery appeared first on SecurityWeek.

WatchGuard has rolled out patches for 15 code execution, DoS, authorization, and path traversal bugs in Fireware OS. The post WatchGuard Patches Critical Fireware OS Code Injection Vulnerability appeared first on SecurityWeek.

Several security firms have confirmed seeing exploitation of the NetScaler vulnerabilities CVE-2026-88771 and CVE-2026-88772. The post Government, Finance Orgs Targeted in Weeks-Long NetScaler Zero-Day Attacks appeared first on SecurityWeek.

Some of the flaws could allow remote attackers to execute arbitrary code or escape the browser sandbox. The post Chrome, Firefox Updates Patch Over 100 Vulnerabilities appeared first on SecurityWeek.

Given that the browser is where business apps are accessed and used, it makes sense that attacks are happening there too. Most breaches today begin in a browser session. Often, they never leave it, with the entire attack chain from initial access to exfiltration playing out in the browser. Here are the six most dangerous techniques that should be on every security team's radar in 2026. 1.

AI coding agents asked to share screenshots of code changes for review have put internal company images in public GitHub repositories, security company Glow said. Its researchers found more than 13,000 internal images from developers at over 300 organizations, including customer billing records and screens of features not yet released. In most cases, they sat under developers' personal accounts

Attacks by autonomous AI agents are moving out of the lab and into the courtroom, raising unsettled questions about who is liable for what agents do. The post Anthropic Flags AI Agent Liability Risks as OpenAI Faces Hacking Lawsuit appeared first on SecurityWeek.

The state-sponsored group has launched larger-scale phishing campaigns to deploy the CosmicPulse backdoor. The post Russian APT Star Blizzard Uses ‘RedFlick’ Infection Chain in Recent Attacks appeared first on SecurityWeek.

ANY.RUN researchers traced a US-focused CSuite phishing campaign across 351 sandbox analyses, with 51% of submissions coming from the United States. Technology, manufacturing, government, and consulting organizations showed the highest exposure. By combining Microsoft 365 session theft with remote-access tool deployment, CSuite can turn a phishing incident into broader account compromise, fraud

In the wake of a suspected leader’s arrest, ShinyHunters says it never intended to publish data stolen from the FBI. The post ShinyHunters Defiant After FBI Calls on Members to Come Forward appeared first on SecurityWeek.

Unknown threat actors have been observed exploiting a newly patched security flaw in Citrix NetScaler ADC and NetScaler Gateway appliances to target organizations in North America and Europe. The activity, observed by Mandiant Consulting and Google Threat Intelligence Group (GTIG) in September 2026, has targeted government, financial services, technology, education, and legal and professional