Roundcube Webmail Issues Security Updates to Address Multiple Vulnerabilities
The development team behind the open-source webmail client Roundcube Webmail has published security updates 1.7.5 and 1.6.20 on October 19, 2026, addressing roughly 20 vulnerabilities across core email functions.
Among the most notable issues, multiple IMAP actions were found susceptible to command injection when attackers supplied specially crafted newline characters, allowing unauthorized commands to be executed on the mail server.
Header-related flaws enabled injection attacks through the sender display name during message resends and via parameters including References, In-Reply-To, Message-ID, and From. Similar problems affected email subjects when forwarding attachments and media types embedded in data URIs for inline images.
The release also corrects weaknesses in server-side request forgery (SSRF) filters that could be bypassed, as well as techniques that leveraged SVG and CSS files to circumvent restrictions on loading external content.
Further corrections include evasion of cross-site request forgery (CSRF) checks during spam marking operations and cross-site scripting (XSS) conditions triggered by error messages from password drivers.
Users are strongly advised to upgrade immediately, as the vulnerabilities impact authentication flows, message rendering, and external resource handling.
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