Vulnerability in Roundcube Webmail
CVE-2026-26079
Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13 allows Cascading Style Sheets (CSS) injection, e.g., because comments are mishandled.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Roundcube Webmail — versions 0, 1.6.0
Weakness classification (CWE)
References
- roundcube.net/news/2026/02/08/security-updates-1.6.13-and-1.5.13
- github.com/roundcube/roundcubemail/releases/tag/1.6.13
- github.com/roundcube/roundcubemail/commit/1f4c3a5af5033747f9685a8a395dbd8228d19…
- github.com/roundcube/roundcubemail/commit/2b5625f1d2ef7e050fd1ae481b2a52dc35466…
- github.com/roundcube/roundcubemail/commit/53d75d5dfebef235a344d476b900c20c12d52…
- github.com/roundcube/roundcubemail/releases/tag/1.5.13
- github.com/roundcube/roundcubemail/commit/bf89cbaa5897d8ad62e8057d9a3f6babb90b7…
- github.com/roundcube/roundcubemail/commit/5a3315cce587e0be58335d11ff9a5571c9049…
- github.com/roundcube/roundcubemail/commit/c15f5dbf093a497e19a749b20e7f8fb5a9c24…
Frequently asked questions
- What is CVE-2026-26079?
- CVE-2026-26079 is a medium-severity vulnerability in Roundcube Webmail, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 4.7/10. Published 2026-02-11.
- How severe is CVE-2026-26079?
- Medium severity. CVSS v3 base score is 4.7 out of 10.