A 0-Day is a software vulnerability without an available fix, creating risk because defenders have limited time to mitigate exploitation.
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Background for this topic.
0-Day describes a software vulnerability unknown to the software maker or unpatched when first exploited. Attackers can use these flaws immediately, as no official fix or signature exists to block the exploit. Such vulnerabilities often affect widely deployed software or hardware, making them valuable for targeted attacks or widespread campaigns.
Because defenders lack patches or reliable detection signatures initially, they must rely on anomaly detection, network monitoring, and threat intelligence to identify suspicious activity linked to 0-day exploits. Rapid patching once a fix is released is critical to reduce exposure. Tracking emerging 0-day threats helps prioritize defensive measures and informs risk management decisions in environments where unpatched vulnerabilities pose significant security risks.
A researcher from offensive security firm Theori has found a nine-year-old flaw in the Linux kernel with the help of AI
The critical CVE-2026-41940 authentication bypass vulnerability in cPanel, WHM, and WP Squared is being actively exploited in the wild and has been leveraged in attempts since late February. [...]
Emergency patches out now for those managing the millions of domains assumed to be affected
Emergency patches out now for those managing the millions of domains assumed to be affected Emergency patches are available for a critical vulnerability in cPanel and WHM that allows attackers to bypass authentication and gain root access to servers managed using it.…
Second try's a charm?
Second try's a charm? Microsoft and the US Cybersecurity and Infrastructure Security Agency (CISA) warned that attackers are exploiting a zero-click Windows flaw that can expose sensitive information on vulnerable systems.…
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has ordered federal agencies to secure their Windows systems against a vulnerability exploited in zero-day attacks. [...]
AI Tool Used to Discover Bugs, Which Included 2 Maximum Severity VulnerabilitiesResearchers at security firm AISLE said they recently identified 38 vulnerabilities, including two maximum-severity zero-day flaws in OpenEMR, an open-source electronic medical record software platform used by about 100,000 healthcare providers globally. OpenEMR has patched the problems.