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CVE-2026-35544

Published: Apr 3, 2026Updated: Apr 9, 2026 Sources: CVE List NVD BDUCWE-669
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 71.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-669

Affected Products

WebmailRoundcube
Web App
Communications / email-server-client
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
RoundCube WebmailThe RoundCube Team
On-prem
Communications / email-server-client
webmailroundcube
Web App
Communications / email-server-client
roundcubeoss-projectDECommunicationsaka roundcube webmail, roundcube
ооо «ред софт»commercialRUOperating Systemsaka red soft
the roundcube teamoss-projectCommunicationsaka roundcube webmail

Exploitability

Official Patch Available

References

https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14
roundcube.net
https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
github.com
https://github.com/roundcube/roundcubemail/commit/226811a1c974271dbedca72672923abaff8191c0
github.com
and 6 more references View all →

Timeline

Published
Apr 3, 2026
Last Updated
Apr 9, 2026

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