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CVE-2026-35540

Published: Apr 3, 2026Updated: Apr 7, 2026 Sources: CVE List NVD BDUCWE-669
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.3%
Top 77.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-669

Affected Products

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
WebmailRoundcube
Web App
Communications / email-server-client
ооо «ред софт»commercialRUOperating Systemsaka red soft
the roundcube teamoss-projectCommunicationsaka roundcube webmail
roundcubeoss-projectDECommunicationsaka roundcube webmail, roundcube

Exploitability

Official Patch Available

References

https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870
github.com
https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.6.14
github.com
and 4 more references View all →

Timeline

Published
Apr 3, 2026
Last Updated
Apr 7, 2026

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