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.
Single click on a phishing link in Google browser blew up sandbox on Windows Google pushed out an emergency patch for Chrome on Windows this week to stop attackers exploiting a sandbox-breaking zero-day vulnerability, seemingly used by snoops to target certain folks in Russia.…
Mozilla has released updates to address a critical security flaw impacting its Firefox browser for Windows, merely days after Google patched a similar flaw in Chrome that came under active exploitation as a zero-day
Trend Research discusses the delivery methods, custom payloads, and techniques used by Water Gamayun, the suspected Russian threat actor abusing a zero-day vulnerability in the Microsoft Management Console framework (CVE-2025-26633) to execute malicious code on infected machines.
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The threat actor known as EncryptHub exploited a recently-patched security vulnerability in Microsoft Windows as a zero-day to deliver a wide range of malware families, including backdoors and information stealers such as Rhadamanthys and StealC
Researchers at Kaspersky discovered cyber-espionage activity that used the vulnerability in a one-click phishing attack to deliver malware.
Google has fixed a high-severity Chrome zero-day vulnerability exploited to escape the browser's sandbox and deploy malware in espionage attacks targeting Russian organizations. [...]
Google has released out-of-band fixes to address a high-severity security flaw in its Chrome browser for Windows that it said has been exploited in the wild as part of attacks targeting organizations in Russia. The vulnerability, tracked as CVE-2025-2783, has been described as a case of "incorrect handle provided in unspecified circumstances in Mojo on Windows." Mojo refers to a
Free unofficial patches are available for a new Windows zero-day vulnerability that can let remote attackers steal NTLM credentials by tricking targets into viewing malicious files in Windows Explorer. [...]
A threat actor known as EncryptHub has been linked to Windows zero-day attacks exploiting a Microsoft Management Console vulnerability patched this month. [...]
Trend Research identified Russian threat actor Water Gamayun exploiting CVE-2025-26633, a zero-day vulnerability in the Microsoft Management Console that attackers exploit to execute malicious code and exfiltrate data.
A threat actor posted data on Breachforums from an alleged supply-chain attack that affected more than 140K tenants, claiming to have compromised the cloud via a zero-day flaw in WebLogic, researchers say.