CVE-2026-35539: XSS

Published Apr 3, 2026
·
Updated

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.

Affected Software

3 affected componentsFixes available
composer/roundcube/roundcubemail>=1.7-beta<1.7-rc5
1.7-rc5
Roundcube Webmail<1.5.14
Roundcube Webmail>=1.6.0<1.6.14

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade composer/roundcube/roundcubemail to a version that resolves this vulnerability.

    Fixed in 1.7-rc5

Event History

Apr 3, 2026
CVE Published
via MITRE·03:39 AM
Data Sourced
via MITRE·03:39 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:16 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:16 AM
RemedyAffected Software
Advisory Published
via GitHub·06:31 AM
Data Sourced
via GitHub·06:31 AM
DescriptionSeverityWeaknessAffected Software
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