The Hacker News | #1 Trusted Source for Cybersecurity News — Index Page

Microsoft on Monday issued out-of-band security patches for a high-severity Microsoft Office zero-day vulnerability exploited in attacks. The vulnerability, tracked as CVE-2026-21509 , carries a CVSS score of 7.8 out of 10.0. It has been described as a security feature bypass in Microsoft Office. "Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally," the tech giant said in an advisory. "This update addresses a vulnerability that bypasses OLE mitigations in Microsoft 365 and Microsoft Office, which protect users from vulnerable COM/OLE controls." Successful exploitation of the flaw relies on an attacker sending a specially crafted Office file and convincing recipients to open it. It also noted that the Preview Pane is not an attack vector. The Windows maker said customers running Office 2021 and later will be automatically protected via a service-side change , but will b...

A critical security flaw has been disclosed in Grist‑Core , an open-source, self-hosted version of the Grist relational spreadsheet-database, that could result in remote code execution. The vulnerability, tracked as CVE-2026-24002 (CVSS score: 9.1), has been codenamed Cellbreak by Cyera Research Labs. "One malicious formula can turn a spreadsheet into a Remote Code Execution (RCE) beachhead," security researcher Vladimir Tokarev, who discovered the flaw, said . "This sandbox escape lets a formula author execute OS commands or run host‑runtime JavaScript, collapsing the boundary between 'cell logic' and host execution." Cellbreak is categorized as a case of Pyodide sandbox escape, the same kind of vulnerability that also recently impacted n8n ( CVE-2025-68668 , CVSS score: 9.9, aka N8scape). The vulnerability has been addressed in version 1.7.9, released on January 9, 2026. "A security review identified a vulnerability in the 'pyodide' ...

Cybersecurity researchers have discovered a JScript -based command-and-control (C2) framework called PeckBirdy that has been put to use by China-aligned APT actors since 2023 to target multiple environments. The flexible framework has been put to use against Chinese gambling industries and malicious activities targeting Asian government entities and private organizations, according to Trend Micro. "PeckBirdy is a script-based framework which, while possessing advanced capabilities, is implemented using JScript, an old script language," researchers Ted Lee and Joseph C Chen said . "This is to ensure that the framework could be launched across different execution environments via LOLBins (living-off-the-land binaries)." The cybersecurity company said it identified the PeckBirdy script framework in 2023 after it observed multiple Chinese gambling websites being injected with malicious scripts, which are designed to download and execute the primary payload in order...

Cybersecurity researchers have discovered an ongoing campaign that's targeting Indian users with a multi-stage backdoor as part of a suspected cyber espionage campaign. The activity , per the eSentire Threat Response Unit (TRU), involves using phishing emails impersonating the Income Tax Department of India to trick victims into downloading a malicious archive, ultimately granting the threat actors persistent access to their machines for continuous monitoring and data exfiltration. The end goal of the sophisticated attack is to deploy a variant of a known banking trojan called Blackmoon (aka KRBanker) and a legitimate enterprise tool called SyncFuture TSM (Terminal Security Management) that's developed by Nanjing Zhongke Huasai Technology Co., Ltd , a Chinese company. The campaign has not been attributed to any known threat actor or group. "While marketed as a legitimate enterprise tool, it is repurposed in this campaign as a powerful, all-in-one espionage framework,...

Cybersecurity researchers have discovered two malicious Microsoft Visual Studio Code (VS Code) extensions that are advertised as artificial intelligence (AI)-powered coding assistants, but also harbor covert functionality to siphon developer data to China-based servers. The extensions, which have 1.5 million combined installs and are still available for download from the official Visual Studio Marketplace , are listed below - ChatGPT - 中文版 (ID: whensunset.chatgpt-china) - 1,340,869 installs ChatGPT - ChatMoss（CodeMoss）(ID: zhukunpeng.chat-moss) - 151,751 installs Koi Security said the extensions are functional and work as expected, but they also capture every file being opened and every source code modification to servers located in China without users' knowledge or consent. The campaign has been codenamed MaliciousCorgi. "Both contain identical malicious code -- the same spyware infrastructure running under different publisher names," security researcher Tuval ...