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 products
roundcube: webmail
References7
- roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1… Vendor Advisory
- github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0… Patch
- github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91… Patch
- github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f… Patch
- github.com/roundcube/roundcubemail/releases/tag/1.5.14 Release Notes
- github.com/roundcube/roundcubemail/releases/tag/1.6.14 Release Notes
- github.com/roundcube/roundcubemail/releases/tag/1.7-rc5 Release Notes
Metrics
- CVSS 3.1
-
6.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 18 · as of 12 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.