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. rcmail_sendmail stripped newline characters only from the Subject and Organization headers, leaving other header values taken from request parameters unsanitized, so a remote authenticated attacker could inject arbitrary headers into an outgoing message via the References, In-Reply-To, Message-ID and From parameters. Upstream fixed this in the commit “Fix mail header injection via References/In-Reply-To/Message-ID/From parameters”, which normalizes whitespace in every string header value.

[ 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/79adcfc0c48012bbbe930278471425027fd7331c
• github.com/roundcube/roundcubemail/commit/acd32a86f631dd6dcda8ac3ec7bd9ba4d4c0c117
• 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