CVE-2026-35539
MEDIUM6.1EPSS 0.01%Roundcube Webmail: Insufficient HTML attachment sanitization in preview mode
Published: 4/3/2026Modified: 4/4/2026
Also known as:GHSA-x4q5-8j5g-hpjc
Description
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 packages (2)
- Debian/roundcubefrom 0, < 1.4.15+dfsg.1-1+deb11u8
- Packagist/roundcube/roundcubemail>= 1.7-beta, < 1.7-rc5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
References (10)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-35539
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-35539
- PATCHhttps://github.com/roundcube/roundcubemail
- WEBhttps://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1
- WEBhttps://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e477c808aa4f
- WEBhttps://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0fca5a0efab
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.5.14
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.6.14
- WEBhttps://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5
- WEBhttps://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14