CVE-2020-35730
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://roundcube.net/news/2020/12/27/security-updates-1.4.10-1.3.16-and-1.2.13; https://nvd.nist.gov/vuln/detail/CVE-2020-35730
Description
An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation Context
as of October 13, 2026- CISA added CVE-2020-35730 to the KEV catalog 906 days after its CVE record was published. The median for entries added in 2023 is 12 days.
- It is one of 11 Roundcube entries in the CISA KEV catalog, and one of 4 added in 2023.
- Its current EPSS score (32.9%) is higher than that of 43% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | - | n/a |
References
9 Links- https://roundcube.net/download/
- https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
- https://www.alexbirnberg.com/roundcube-xss.html
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
- https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
Record Details
More from Roundcube
Roundcube Webmail Remote Code Execution Vulnerability
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RoundCube Webmail Deserialization of Untrusted Data Vulnerability
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.