The Winter Vivern APT group has been exploiting a zero-day vulnerability (CVE-2023-5631) in Roundcube webmail servers to spy on email communications of European governmental entities and a think tank, according to ESET researchers. “Exploitation of the XSS vulnerability can be done remotely by sending a specially crafted email message,” the researchers noted. “No manual interaction other than viewing the message in a web browser is required.” Exploting CVE-2023-5631 Roundcube is an open-source browser-based email client … More
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