Nation State Hackers Exploiting Zero-Day in Roundcube Webmail Software

The threat actor known as Winter Vivern has been observed exploiting a zero-day flaw in Roundcube webmail software on October 11, 2023, to harvest email messages from victims' accounts. "Winter Vivern has stepped up its operations by using a zero-day vulnerability in Roundcube," ESET security...

Winter Vivern APT Targets European Government Entities with Zimbra Vulnerability

The advanced persistent threat APT actor known as Winter Vivern is now targeting officials in Europe and the U.S. as part of an ongoing cyber espionage campaign. "TA473 since at least February 2023 has continuously leveraged an unpatched Zimbra vulnerability in publicly facing webmail portals tha...