The national team for responding to cyber incidents, cyber attacks, cyber threats CERT-UA detects a new wave of targeted cyber attacks using a fresh vulnerability in Microsoft Office. They are aimed at government bodies of Ukraine and organizations in EU countries. This was reported by the State Service for Special Communications and Information Protection of Ukraine on Monday.. " The very next day, the attackers created a malicious document on the topic of EU consultations on Ukraine, which exploited this vulnerability, and launched a massive attack on the Ukrainian authorities. Under the guise of a newsletter from the Ukrhydrometcenter, they sent malicious letters with the file “BULLETEN_H” to more than 60 addresses of ministries and departments. doc" The CERT-UA website says that opening this document using Microsoft Office leads to the establishment of a network connection with an external resource using the WebDAV protocol. " dll" png" Experts recommend installing updates from Microsoft and/or adjusting the Windows registry as indicated in the official instructions, as well as limiting or carefully checking connections with the Filen cloud storage (filen. io). The CERT-UA website reports that hackers from the UAC-0001 (APT28) group are carrying out cyber attacks against Ukraine and EU countries using the exploit CVE-2026-21509 (CERT-UA#19542). We would like to remind you that since the beginning of the full-scale invasion of the Russian Federation, specialists from the Cyber \u200b\u200bSecurity Department of the Security Service of Ukraine have neutralized more than 14 thousand cyber attacks and cyber incidents on the resources of the central authorities and critical infrastructure of Ukraine. Poland accused Russian intelligence services of cyberattacks on the energy sector News from Telegram and WhatsApp. Subscribe to our channels https://t. me/korrespondentnet and WhatsApp Author: 1.