Overview
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.
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
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2020-35730 |
| Vendor / Product | Roundcube — Roundcube Webmail |
| NVD Published | 2020-12-28 |
| NVD Last Modified | 2025-11-04 |
| CVSS 3.1 Score | 6.1 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| Severity | MEDIUM |
| CWE | CWE-79 |
| CISA KEV Added | 2023-06-22 |
| CISA KEV Deadline | 2023-07-13 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Required Action
CISA BOD 22-01 Deadline: 2023-07-13.
Apply updates per vendor instructions.
Timeline
| Date | Event |
|---|---|
| 2023-06-22 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2023-07-13 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2020-35730 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |