Microsoft issued an emergency patch for a high-severity zero-day vulnerability in Office that allows attackers to bypass document security checks and is being exploited in the wild via malicious files.
Microsoft pushed the emergency patch for the zero‑day, tracked as CVE-2026-21509, and classified it as a “Microsoft Office Security Feature Bypass Vulnerability” with a CVSS score of 7.8 out of 10. The flaw allows attackers to bypass Object Linking and Embedding (OLE) mitigations that are designed to block unsafe COM/OLE controls inside Office documents. This means a malicious attachment could infect a PC despite built-in protections.
Read more…
Source: Malwarebytes Labs
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- Router Network Isolation Broken By Covert Data Exfiltration
August 18, 2019
Software-based network isolation provided by routers is not as efficient as believed, as hackers can smuggle data between the networks for exfiltration. Most modern routers offer the possibility to split the network into multiple segments that work separately. One example is a guest network that works in parallel with the host. The boundary insulates sensitive or critical ...
- British Airways E-Ticketing Flaw Exposes Passenger Flight, Personal Data
August 13, 2019
A vulnerability in British Airways’ e-ticketing system could enable a bad actor to view passengers’ personal data or change their booking information. A security bug discovered in British Airways’ e-ticketing system has the potential to expose passengers’ data, including their flight booking details and personal information. Researchers on Tuesday said that check-in links being sent by British ...
- Microsoft names top security researchers, zero-day contributors
August 9, 2019
At the Black Hat security conference in Las Vegas, Microsoft announced the top security researchers and enterprise partners who contributed the most vulnerability and zero-day reports affecting the company’s products. Microsoft’s list of top contributors has become a Black Hat tradition, and many industry experts use it as a guide to today’s top bug hunters. Security researchers ...
- Three major vulnerabilities found in Cisco SMB switches
August 7, 2019
Three of Cisco’s most popular switches for SMBs contain serious security flaws that could allow a hacker to remotely access the device and infiltrate an organisation’s network. The critical vulnerabilities, which affect Cisco’s Small Business 220 Series of smart switches, include a remote code execution (RCE) bug rated 9.8/10 by Cisco in terms of threat severity, an authentication bypass rated 9.1/10 ...
- KDE Linux Desktops Could Get Hacked Without Even Opening Malicious Files
August 7, 2019
If you are running a KDE desktop environment on your Linux operating system, you need to be extra careful and avoid downloading any “.desktop” or “.directory” file for a while. A cybersecurity researcher has disclosed an unpatched zero-day vulnerability in the KDE software framework that could allow maliciously crafted .desktop and .directory files to silently run ...
- New Windows hack warning: Patch Intel systems now to block SWAPGSAttack exploits
August 6, 2019
A newly uncovered vulnerability affecting every Windows computer using an Intel processor built since 2012 could allow attackers to bypass safeguards and access information held in a system’s protected kernel memory. This new side-channel attack is built on previous research into other CPU vulnerabilities – such as Spectre and Meltdown – but this new vulnerability can bypass the ...