Vulnerability 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.
CVSS Score
6.1
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Roundcube | Webmail | < 1.5.14 |
Related Weaknesses (CWE)
References
- https://github.com/roundcube/roundcubemail/commit/10a6d1fa8acac85c727b0a6ae4a664Patch
- https://github.com/roundcube/roundcubemail/commit/1b30edf5369668c92fe91dae3d52e4Patch
- https://github.com/roundcube/roundcubemail/commit/d742954ccbcdee7020f8f2e7c49ce0Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.5.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.14Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5Release Notes
- https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14Vendor Advisory
FAQ
What is CVE-2026-35539?
CVE-2026-35539 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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.
How severe is CVE-2026-35539?
CVE-2026-35539 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35539?
Check the references section above for vendor advisories and patch information. Affected products include: Roundcube Webmail.