Vulnerability in Roundcube Webmail
CVE-2026-114726
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability in the Bounce (resend) action. rcube_mime::decode_address_list() did not strip control characters from the decoded display name, so a received message whose From display-name carries CRLF sequences in an encoded word could inject arbitrary headers into the message emitted when the user bounces it. Upstream fixed this in the commit “Fix mail header injection via the From display-name in the Bounce (resend) action”.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- bugs.debian.org/1151279 (issue-tracking, third-party-advisory)
- github.com/roundcube/roundcubemail/commit/3a136465c965776a5f636587187626985dae4… (patch)
- github.com/roundcube/roundcubemail/commit/d3a35545fdaf72b02a9a4d670064895488e9d… (patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.20 (release-notes, patch)
- github.com/roundcube/roundcubemail/releases/tag/1.7.5 (release-notes, patch)
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (release-notes, vendor-advisory)
Frequently asked questions
- What is CVE-2026-114726?
- CVE-2026-114726 is a medium-severity vulnerability in Roundcube Webmail, classified under Resource Injection. CVSS score: 5.8/10. Published 2026-10-22.
- How severe is CVE-2026-114726?
- Medium severity. CVSS v3 base score is 5.8 out of 10.