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ソフトウェアやハードウェアの脆弱性が発見された直後で、修正プログラムが未公開である状態を指す。脆弱性の修正手段が確立されるまでの期間が「0日」であることから「ゼロデイ（Zero-day）」...
Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December 2025. The finding, de...
Microsoft has disclosed two new zero-day vulnerabilities in Microsoft Defender that are actively being exploited in the wild, raising concerns among security professionals and ente...
Hasn't released it to the public, because it would break the internet - in a bad way For years, the infosec community’s biggest existential worry has been quantum computers blowing...
An Adobe Reader zero-day vulnerability is being actively exploited via malicious PDFs, allowing hackers to steal data without user interaction, with no patch available.
Internet-facing PAN-OS firewalls are once again doing impressions of initial access brokers
Huntress is warning that threat actors are exploiting three recently disclosed security flaws in Microsoft Defender to gain elevated privileges in compromised systems. The activity...
One security researcher discovered a previously unpatched vulnerability in Windows and reported it to the Microsoft Security Response Center. However, they didn’t respond to his re...
Security researchers at EXPMON have uncovered a highly sophisticated, unpatched zero-day vulnerability actively targeting Adobe Reader users. The exploit, first detected in the wil...
Anthropic restricted its Mythos Preview model last week after it autonomously found and exploited zero-day vulnerabilities in every major operating system and browser. Palo Alto Ne...
A security researcher operating under the alias “Chaotic Eclipse” has publicly released a proof-of-concept (PoC) exploit for a vulnerability in Microsoft Defender. Published on Apr...
Microsoft warned the disclosure of several unpatched vulnerabilities without notice has put “customers at unnecessary risk”
A security researcher by the name of Nightmare-Eclipse (also known as Chaotic Eclipse) has warned of a critical security vulnerability in Windows 11 that could be exploited by hack...
A researcher leaked a zero‑day vulnerability dubbed “BlueHammer” to protest Microsoft’s handling of the private disclosure process. Although the published code contains implementat...
米Microsoftは5月27日、事前共有なしにゼロデイ脆弱性（修正前の弱点）を公表する行為について、公式ブログで批判した。同社は顧客保護のため24時間体制で対応中とし、「協調的脆弱性開示（CVD...
A critical security vulnerability in Adobe Reader is being actively exploited by cybercriminals through a sophisticated and evolving phishing campaign. The attack relies on social...
Six 0-days, three under active exploitation, more to come on July 14?
The Google Threat Intelligence Group said its proactive measures stopped a "mass exploitation event."
Malicious PDFs abuse legit features to harvest system data and decide which victims get a 2nd-stage payload Hackers have been quietly exploiting what appears to be a zero-day in Ad...
Threat actors are actively exploiting a PAN‑OS zero‑day that impacts the User‑ID Authentication (Captive) Portal. This exploit enables unauthenticated remote code execution with ro...
Sergiu Gatlan / BleepingComputer: Researchers: attackers have been exploiting a zero-day vulnerability in Adobe Reader since at least December 2025, and some docs contain Russian-l...
On Tuesday, Anthropic unveiled its latest AI model called Claude Mythos. This “general-purpose, unreleased frontier model” is so impressively powerful that Anthropic is wary of rel...
Broken disclosure embargo left admins facing a fresh root-level flaw with no CVE
Reports confirm active exploitation of a previously unknown zero‑day vulnerability in Adobe Acrobat Reader since at least December 2025. Attackers are delivering malicious PDF file...
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