Critical Microsoft Excel bug weaponizes Copilot Agent for zero-click information disclosure attack


After a whopper of a Patch Tuesday last month, with six Microsoft flaws exploited as zero-days, March didn’t exactly roar in like a lion. Just two of the 83 Microsoft CVEs released on Tuesday are listed as publicly known, and none is under active exploitation, which we’re sure is a welcome change to sysadmins.

Another eight of the 83 Microsoft CVEs are considered critical, and one of these – to quote Zero Day Initiative chief bug hunter Dustin Childs – is “fascinating.” Plus, it’s got an AI-attack component, so we’re going to start with it. CVE-2026-26144 is a critical-severity information disclosure vulnerability in Microsoft Excel.

Read more…
Source: The Register News


Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox


Related:

  • Guidance for investigating attacks using CVE-2022-21894: The BlackLotus campaign

    April 11, 2023

    This guide provides steps that organizations can take to assess whether users have been targeted or compromised by threat actors exploiting CVE-2022-21894 via a Unified Extensible Firmware Interface (UEFI) bootkit called BlackLotus. UEFI bootkits are particularly dangerous as they run at computer startup, prior to the operating system loading, and therefore can interfere with or ...

  • CISA Adds Two Known Exploited Vulnerabilities to Catalog

    April 10, 2023

    CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. CVE-2023-28206 Apple iOS, iPadOS, and macOS IOSurfaceAccelerator Out-of-Bounds Write Vulnerability Read more… Source: U.S. Cybersecurity and Infrastructure Security Agency Related story: CISA Adds Five Known Exploited Vulnerabilities to Catalog Related story: CISA Releases Seven Industrial Control Systems Advisories  

  • Apple fixes recently disclosed zero-days on older iPhones and iPads

    April 10, 2023

    Apple has released emergency updates to backport security patches released on Friday, addressing two actively exploited zero-day flaws also affecting older iPhones, iPads, and Macs. “Apple is aware of a report that this issue may have been actively exploited,” the company said in security advisories published on Monday. Read more… Source: Bleeping Computer  

  • Welcome to open source, Elon. Your Twitter code just got a CVE for shadow ban bug

    April 7, 2023

    The chunk of internal source code Twitter released the other week contains a “shadow ban” vulnerability serious enough to earn its own CVE, as it can be exploited to bury someone’s account of sight “without recourse.” The issue was discovered by Federico Andres Lois while reviewing the tweet recommendation engine that’s said to power Twitter’s For ...

  • Apple fixes two zero-days exploited to hack iPhones and Macs

    April 7, 2023

    Apple has released emergency security updates to address two new zero-day vulnerabilities exploited in attacks to compromise iPhones, Macs, and iPads. “Apple is aware of a report that this issue may have been actively exploited,” the company said when describing the issues in security advisories published on Friday. Read more… Source: Bleeping Computer  

  • CISA Adds One Known Exploited Vulnerability to Catalog

    April 3, 2023

    CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. CVE-2022-27926 Zimbra Collaboration (ZCS) Cross-Site Scripting (XSS) Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Note: Read more… Source: U.S. Cybersecurity and Infrastructure Security Agency