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Vulnerability · Published Feb 11, 2026 · Assigned by mitre

CVE-2026-26079

Medium 4.7

In plain English

A medium-severity security flaw in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.3%top 71.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12roundcube1.6.5+dfsg-1+deb12u7DSA-6137-1
Debian:12roundcube1.6.5+dfsg-1+deb12u7DEBIAN-CVE-2026-26079
Debian:13roundcube1.6.13+dfsg-0+deb13u1DSA-6137-1
Debian:13roundcube1.6.13+dfsg-0+deb13u1DEBIAN-CVE-2026-26079
Debian:14roundcube1.6.13+dfsg-1DEBIAN-CVE-2026-26079
Ubuntu:25.10roundcubeno fix listedUBUNTU-CVE-2026-26079
Ubuntu:26.10roundcubeno fix listedUBUNTU-CVE-2026-26079

Affected products (as reported)

VendorProductVersions
Roundcube Webmail 0 – before 1.5.131.6.0 – before 1.6.13

Weakness: CWE-829 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

References