CVE-2026-35544

MEDIUM EPSS 28.5%
Published Apr 3, 20262mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
28.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-669

Affected Products 2

VendorProductVersionRange
roundcubewebmail* ≤1.5.13
roundcubewebmail*≥1.6.0  –  ≤1.6.13

References 7

  • github.com https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7
    Patch
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.5.14
    Release Notes
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
    Release Notes
  • github.com https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
    Release Notes
  • roundcube.net https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
    Vendor Advisory

Remediation

  • github.com https://github.com/roundcube/roundcubemail/commit/099009b9c8e1d3c636fb9a5af72f7c2596018662
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
    Patch
  • github.com https://github.com/roundcube/roundcubemail/commit/57dec0c127b98e0c8e3b9c26c80049b9c4bcaea7
    Patch