CVE-2026-35540

MEDIUM

5.4

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.

CVE Details

CVSS v3.1 Score5.4

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/3/2026

Last Modified4/3/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-669

References

https://github.com/roundcube/roundcubemail/commit/27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870(cve@mitre.org)

https://github.com/roundcube/roundcubemail/commit/579b68eff90650a5c782e153debd66c765648942(cve@mitre.org)

https://github.com/roundcube/roundcubemail/releases/tag/1.6.14(cve@mitre.org)

https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5(cve@mitre.org)

https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14(cve@mitre.org)

IOC Correlations

No correlations recorded

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