Is CVE-2026-114717 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-114717 being exploited in the wild.

How severe is CVE-2026-114717?

Medium severity, with a CVSS score of 4, published 22 October 2026.

Which products and versions are affected?

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5.

Is there a fix for CVE-2026-114717?

Yes: fixed in Roundcube Webmail 1.6.20, 1.7.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-114717 attacked?

It is attacked over the network.

Am I affected by CVE-2026-114717?

Check whether you run Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-114717: Roundcube Webmail mail header injection via forwarded message subject

CVE-2026-114717 · Severity: medium · CVSS 4 · Published 2026-10-22

Roundcube Webmail is a web-based email client used by organizations to access email. When a user forwards a message as an attachment, the application uses the original message's subject line to generate the attachment filename without proper sanitization. An attacker can craft an email with CRLF sequences in the subject to inject arbitrary MIME headers into outgoing messages, potentially allowing mail spoofing or other header-based attacks.

Technologies: Roundcube Webmail. Vendors: Roundcube.

Quick answers

Is CVE-2026-114717 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-114717 being exploited in the wild.
How severe is CVE-2026-114717?: Medium severity, with a CVSS score of 4, published 22 October 2026.
Which products and versions are affected?: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5.
Is there a fix for CVE-2026-114717?: Yes: fixed in Roundcube Webmail 1.6.20, 1.7.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-114717 attacked?: It is attacked over the network.
Am I affected by CVE-2026-114717?: Check whether you run Roundcube Webmail at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Roundcube Webmail 1.6.20, 1.7.5

Technical details

The vulnerability is a mail header injection flaw in the message forwarding-as-attachment feature. When generating the attachment filename, Roundcube fails to sanitize CRLF (carriage return/line feed) sequences in the original message subject, allowing an attacker to inject arbitrary MIME part headers. The fix collapses whitespace in the generated attachment name. This requires the attacker to send a crafted email and the victim to forward it as an attachment.

Affected products

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5

Timeline

2026-10-22: disclosed

References

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