Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability.
Affects Roundcube Webmail 1.6.0 through 1.6.19 and 1.7.0 through 1.7.4. Fixed in 1.6.20 and 1.7.5.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Fix
- Fixed in 1.6.20, 1.7.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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().
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Roundcube Webmail
From 1.6.0 · fixed in 1.6.20; From 1.7.0 · fixed in 1.7.5
References 6
bugs.debian.org
GitHub · roundcube/roundcubemail
roundcube.net
Questions about CVE-2026-114716
What does this mean?
A crafted media type in an inline image data URI can inject extra mail headers into outgoing messages sent by Roundcube Webmail. This lets the injected content alter how the message is built and delivered.Source: roundcube.net
Am I affected, and how do I check?
Roundcube Webmail 1.6 LTS releases before 1.6.20 and 1.7 releases before 1.7.5 are in scope. To check a installation, look at the version shown in the Roundcube About page or in the package version on the server.Source: roundcube.net
What should I do about it?
Upgrade to Roundcube Webmail 1.6.20 if you run the 1.6 LTS line, or to 1.7.5 if you run the 1.7 line. The security updates 1.6.20 and 1.7.5 contain the fix.Source: roundcube.net
Is it being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data