Cybersecurity
Cybersecurity news — Sunday 27 September 2026
7 stories from 4 sources, every one in English. Each links to its publisher.
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OpenAI is preparing “o,” an always-on ChatGPT assistant that could handle email
BleepingComputer
OpenAI is testing a new always-on assistant called "o", and references to the unannounced feature briefly showed up on the company's website. [...]
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Citrix admins warned to shut down NetScalers over 2 exploited zero-days
BleepingComputer
Citrix has confirmed that two critical NetScaler remote code execution vulnerabilities, tracked as CVE-2026-88771 and CVE-2026-88772, are being exploited in attacks and that it has released security updates to fix the flaws. [...]
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Wireshark 4.6.9 Released, (Sun, Sep 27th)
SANS ISC
Wireshark release 4.6.9 fixes 19 vulnerabilities and 16 bugs.
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Cloudflare fixes Containers cross-tenant flaw exposing customer data
BleepingComputer
Cloudflare has fixed a vulnerability in Containers and Sandboxes that allowed customers with a Workers Paid account to recover residual data from other customers' containers on the same physical host. [...]
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Anthropic turns Claude into an AI marketplace with 2,000+ plugins and connectors
BleepingComputer
Anthropic has just announced a new Claude Marketplace, and it brings all AI-related tools into one place, including plugins, connectors, agents, and more. [...]
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Microsoft SharePoint Flaw CVE-2026-65660 Now Exploited in Attacks
SecurityWeek
CISA added CVE-2026-65660 to its KEV catalog, giving federal agencies a patching deadline of September 28. The post Microsoft SharePoint Flaw CVE-2026-65660 Now Exploited in Attacks appeared first on SecurityWeek .
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Warning: Two Unpatched Citrix NetScaler RCE Zero-Days Under Active Exploitation
The Hacker News
Two critical vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway that allow remote code execution have been exploited in the wild, Citrix confirmed on September 27. It released fixes for both, along with six other flaws. One of…