CISA Orders Urgent Patching After Chinese Hackers Exploit SharePoint Flaws in Live Attacks

The U.S. Cybersecurity and Infrastructure Security Agency (CISA), on July 22, 2025, added two Microsoft SharePoint flaws, CVE-2025-49704 and CVE-2025-49706, to its Known Exploited Vulnerabilities (KEV) catalog, based on evidence of active exploitation. To that end, Federal Civilian Executive Branch (FCEB) agencies are required to remediate identified vulnerabilities by July 23, 2025. “CISA is

Proof of Concept for Microsoft Word RTF Font Table Heap Corruption (CVE-2023-21716) Released

Update 3/14 – Coverage section updated with available IPS signature.FortiGuard Labs is aware of a new proof of concept released over the weekend for CVE-2023-21716 (Microsoft Word Remote Code Execution Vulnerability).Patched in the February Microsoft Monthly Security Release, CVE-2023-21716 is a vulnerability within Microsoft Office’s wwlib which allows attackers to achieve remote code execution on…

Microsoft Links Ongoing SharePoint Exploits to Three Chinese Hacker Groups

Microsoft has formally tied the exploitation of security flaws in internet-facing SharePoint Server instances to two Chinese hacking groups called Linen Typhoon and Violet Typhoon as early as July 7, 2025, corroborating earlier reports. The tech giant said it also observed a third China-based threat actor, which it tracks as Storm-2603, weaponizing the flaws as…