CVE DATABASE / CVE-2020-35730
CVE-2020-35730
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
CVSS 6.1 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2023-06-22.
Federal remediation due 2023-07-13.
Required action: Apply updates per vendor instructions.
Summary
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.
CVSS 3.1 breakdown
| Base score | 6.1 (MEDIUM) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | CHANGED |
| Confidentiality | LOW |
| Integrity | LOW |
| Availability | NONE |
Weakness type (CWE)
Affected products
Roundcube webmailFedoraproject fedoraDebian debian linux
Check this CVE live
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
- https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
- https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
- https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
- https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/
- https://roundcube.net/download/
- https://www.alexbirnberg.com/roundcube-xss.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730
Data: NIST NVD + CISA KEV. NVD last modified 2025-11-04. Always verify against the vendor advisory before acting.