Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability (CVE-2020-35730)
Severity: medium · Patch status: patched · Since 2023-06-22 · CVE-2020-35730
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 linkrefaddinindex in rcubestringreplacer.php. CISA added CVE-2020-35730 to its Known Exploited Vulnerabilities catalog on Jun 22, 2023, which means attackers are exploiting it in the wild.
What to do
- Apply updates per vendor instructions.
- US federal agencies must remediate by Jul 13, 2023 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch