CVE-2026-35544CWE-669

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14

Medium · published April 3, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
42.4
In the wild
Unconfirmed
What it is

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00507 · 42.4th percentile
Weakness
CWE-669 · Incorrect Resource Transfer Between Spheres
Published
2026-04-03T03:59Z
EPSS history
Timeline
  • 03 APR 03:59Z
    An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14
    cvelistv5