CVE-2026-35539 in Webmail
Summary
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.
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Responsible
MITRE
Reservation
04/03/2026
Disclosure
04/03/2026
Status
Confirmed
Entries
VulDB provides additional information and datapoints for this CVE:
| ID | Vulnerability | CWE | Exp | Cou | CVE |
|---|---|---|---|---|---|
| 355062 | Roundcube Webmail HTML Attachment HTML injection | 79 | Not defined | Official fix | CVE-2026-35539 |