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.

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.

EPSS: 0.003 (20.8th percentile) — read the EPSS interpretation.

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.

Affected products

Roundcube Webmail — versions 0, 1.6.0

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org
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cve@mitre.org
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cve@mitre.org

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.