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:
- CISA Issues Emergency Directive Requiring Federal Agencies To Mitigate Apache Log4j Vulnerabilities
December 17, 2021
WASHINGTON – The Cybersecurity and Infrastructure Security Agency (CISA) issued Emergency Directive (ED) 22-02 today requiring federal civilian departments and agencies to assess their internet-facing network assets for the Apache Log4j vulnerabilities and immediately patch these systems or implement other appropriate mitigation measures. This Directive will be updated to further drive additional mitigation actions. The directive is in response to the active exploitation by multiple threat actors of vulnerabilities found in the widely used Java-based ...
- Over Log4j? VMware has another critical flaw for you to patch
December 17, 2021
VMware customers have probably had a busy week because more than 100 of the IT giant’s products are impacted by the Log4j bug. Now they need to make another urgent patching effort, because the virty giant has identified another critical flaw in its products that it rates as requiring urgent attention. Security advisory VMSA-2021-0029, which pertains CVE-2021-22054, ...
- Lenovo laptops vulnerable to bug allowing admin privileges
December 16, 2021
Lenovo laptops, including ThinkPad and Yoga models, are vulnerable to a privilege elevation bug in the ImControllerService service allowing attackers to execute commands with admin privileges. The flaws are tracked as CVE-2021-3922 and CVE-2021-3969 and affect the ImControllerService component of all Lenovo System Interface Foundation versions below 1.1.20.3. When viewing the Windows services screen, this service ...
- DHS Announces “Hack DHS” Bug Bounty Program to Identify Potential Cybersecurity Vulnerabilities
December 14, 2021
WASHINGTON – Today, the Department of Homeland Security (DHS) announced the launch of “Hack DHS,” a bug bounty program to identify potential cybersecurity vulnerabilities within certain DHS systems and increase the Department’s cybersecurity resilience. Through Hack DHS, vetted cybersecurity researchers who have been invited to access select external DHS systems (“hackers”) will identify vulnerabilities (“bugs”) ...
- Second Log4j vulnerability CVE 2021-45046 discovered, patch already released
December 14, 2021
A second vulnerability involving Apache Log4j was found on Tuesday after cybersecurity experts spent days attempting to patch or mitigate CVE-2021-44228. The description of the new vulnerability, CVE 2021-45046, says the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was “incomplete in certain non-default configurations.” “This could allow attackers… to craft malicious input data using a JNDI ...
- CISA Issues Apache Log4j Vulnerability Guidance
December 14, 2021
CISA and its partners, through the Joint Cyber Defense Collaborative, are responding to active, widespread exploitation of a critical remote code execution (RCE) vulnerability (CVE-2021-44228) in Apache’s Log4j software library, versions 2.0-beta9 to 2.14.1, known as “Log4Shell” and “Logjam.” Log4j is very broadly used in a variety of consumer and enterprise services, websites, and applications—as ...