June 22, 2023 · Applied Cybernetics Group
CVE-2020-35730 — Roundcube Roundcube Webmail
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
- Added to KEV
2023-06-22- Federal due date
2023-07-13- Vendor
- Roundcube
- Product
- Roundcube Webmail
- EPSS
- 98.3th percentile (score 0.327, as of
2026-09-16) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-35730
CISA short description
Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows an attacker to send a plain text e-mail message with Javascript in a link reference element that is mishandled by linkref_addinindex in rcube_string_replacer.php.
Required action
Apply updates per vendor instructions.