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.

What is CVE-2026-114726?

CVE-2026-114726 is a medium-severity vulnerability in Roundcube Webmail, published on 22 Oct 2026.

Official description

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”.

Weakness: CWE-99

Which versions are affected by CVE-2026-114726?

It affects 1 product.

Products include Roundcube Webmail.

How do I fix CVE-2026-114726?

Upgrade to a fixed version.

Is CVE-2026-114726 being exploited?

There is no known exploitation of CVE-2026-114726 in the wild and no public exploit code.

Other vulnerabilities in Roundcube Webmail

• CVE-2024-42009 RoundCube Webmail Cross-Site Scripting Exploited Critical 9.3
• CVE-2025-68461 RoundCube Webmail Cross-site Scripting Exploited High 7.2
• CVE-2008-5619 PHPMailer susceptible to arbitrary code execution Critical 10.0
• CVE-2024-37385 Command injection in n/a Critical 9.8
• CVE-2024-42008 Cross-site scripting in n/a Critical 9.3

All Roundcube Webmail vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-114726, GHSA-hpmj-jmwh-pghr, UBUNTU-CVE-2026-114726.