CVE-2026-35539
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Roundcube Webmail
PublishedApr 3, 2026
First seenApr 3, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- roundcube webmail1.5.14, 1.6.14 or later
- roundcube/roundcubemail1.7-rc5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| roundcube webmail | v < 1.5.14, 1.6.0 ≤ v < 1.6.14 | 1.5.14, 1.6.14 |
| roundcube/roundcubemailPackagist | 1.7-beta ≤ v < 1.7-rc5 | 1.7-rc5 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.