Vulnerability in Roundcube Webmail

[ Description ]Official description

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability when a message is forwarded as an attachment. The subject of the forwarded message was used verbatim to generate the attachment name, so a received message whose subject contains CRLF sequences could inject arbitrary MIME part headers into the outgoing message. Upstream fixed this in the commit “Fix mail header injection via subject of a message forwarded as attachment”, which collapses whitespace in the generated name.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4043

  Roundcube Webmail: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-114720CVE-2026-114727CVE-2026-114732+16 more CVEs

[ References ]References

• bugs.debian.org/1151279
• github.com/roundcube/roundcubemail/commit/4c3291ce9df9e1d3b45330d0854d65cd8efbeee9
• github.com/roundcube/roundcubemail/commit/c325953a251d0132f1909569b3eac0b974095dd4
• github.com/roundcube/roundcubemail/releases/tag/1.6.20
• github.com/roundcube/roundcubemail/releases/tag/1.7.5
• roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5