High 8.5Published Oct 21, 2026

CVE-2026-114716Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability.

Updated under an hour ago (Oct 28, 2026, 12:30 PM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.39%, higher than 33% of scored CVEs.

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Every CVE for Roundcube Webmail

Exploited in the last 30 days

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().

CVSS: 8.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Weakness (CWE): CWE-99
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.39% (percentile 33)
Assigned by: mitre
NVD analysis: Undergoing Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

Roundcube Webmail roundcube:webmail (from the name)	from 1.6.0 before 1.6.20; from 1.7.0 before 1.7.5	CNA record

References

References

https://bugs.debian.org/1151279	issue-tracking, third-party-advisory
https://github.com/roundcube/roundcubemail/commit/7f3cc9cacb16cb3ab047fe8e3cba81db2023cdfc	patch
https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5	vendor-advisory, release-notes
https://github.com/roundcube/roundcubemail/releases/tag/1.7.5	release-notes, patch
https://github.com/roundcube/roundcubemail/releases/tag/1.6.20	release-notes, patch
https://github.com/roundcube/roundcubemail/commit/adb9b9b3fd43e30af1c166b79494726d89f828eb	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.