CVE-2026-114716
HIGHDescription
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().
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 33% of all known CVEs.
References
Related Vulnerabilities
Other CWE-99 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-6545 | High | 7.5 | 14% | - | - |
| CVE-2021-22879 | High | 8.8 | 5.0% | - | Fix |
| CVE-2016-8615 | Medium | 5.3 | 4.7% | - | Fix |
| CVE-2017-5159 | Critical | 9.8 | 2.4% | - | - |
| CVE-2022-39369 | High | 8.0 | 2.0% | - | Fix |
| CVE-2022-3774 | Medium | 5.4 | 1.5% | - | - |
Common questions
How do I fix CVE-2026-114716?
Upgrade roundcube on debian 13 to 1.6.20+dfsg-0+deb13u1 or later.
Is CVE-2026-114716 being actively exploited?
Not that we know of. CVE-2026-114716 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.39% is the estimated probability that it will be exploited in the next 30 days. That is higher than 33% of all scored CVEs.
How severe is CVE-2026-114716?
CVE-2026-114716 has a CVSS v3 base score of 8.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-114716 affect?
Published advisories record a fix for roundcube (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-114716
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-26.