CVE-2020-35730 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2023-06-22
Roundcube Webmail contains a cross-site scripting (XSS) vulnerability where JavaScript in a link reference element within a plain text email is mishandled by the linkref_addindex function in rcube_string_replacer.php. This allows a remote attacker to execute arbitrary script in the context of the victim's browser session.
Yes. CVE-2020-35730 is known to be exploited in the wild, first recorded on 22 June 2023. Treat it as urgent.
How severe is CVE-2020-35730?
Critical severity, with a CVSS score of 6.1, published 22 June 2023.
Which products and versions are affected?
Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, 1.4.x before 1.4.10.
Is there a fix for CVE-2020-35730?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2020-35730 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2020-35730?
Check whether you run Roundcube Webmail. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Affected products
Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, 1.4.x before 1.4.10
Timeline
2020-12-27: disclosed: Initial CVE assignment/disclosure date based on CVE ID year and external references
2023-06-22: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
2023-06-22: exploited: Confirmed exploited in the wild per CISA KEV entry