CVE-2026-114716 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114716?
CVE-2026-114716 is a high-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. rcmail_sendmail::extract_inline_images() used the media type taken from an inline image data URI without validating it, so a remote authenticated attacker could inject arbitrary MIME part headers into the outgoing message by placing CRLF sequences in that media type. Upstream fixed this in the commit “Fix mail header injection via media type in an inline image data URI”, which validates the media type with rcube_mime::is_mimetype_valid().
Weakness: CWE-99
Which versions are affected by CVE-2026-114716?
How do I fix CVE-2026-114716?
Upgrade to a fixed version.
Is CVE-2026-114716 being exploited?
There is no known exploitation of CVE-2026-114716 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-114716, GHSA-cvhp-44hv-w2ph, UBUNTU-CVE-2026-114716.