Recent RoundCube Webmail Vulnerability Exploited in Attacks
Summary
A recently patched vulnerability in RoundCube Webmail is being actively exploited. The flaw, patched in December 2025 (likely a typo and meant to be 2023 or 2024 given the current date), allows for cross-site scripting (XSS) attacks through the use of animate tags within SVG documents.
IFF Assessment
Exploitation of a RoundCube Webmail vulnerability poses a direct threat to defenders and users of the platform.
Severity
Defender Context
Defenders should ensure they have applied the relevant patches for the RoundCube Webmail vulnerability to prevent exploitation. XSS vulnerabilities are commonly targeted, and filtering user-supplied content and keeping software up-to-date are crucial defense strategies. Monitor webmail logs for unusual SVG activity or attempts to inject malicious code.