CVE-2020-35730VulnerabilityPublished 06/22/2023Updated 10/24/2026
CVE-2020-35730: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
Affects Roundcube Roundcube WebmailSource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 06/22/2023
- KEV deadline
- 07/13/2023
- EPSS
- 32.9% chance of exploitation in 30 days – higher than 98% of CVEs
What to do
CISA required action
Apply updates per vendor instructions.
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.