CVE-2020-35730—Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Vulnerability Name

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

Apply updates per vendor instructions.

Additional 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

Related News Articles

• APT28 Uses Signal Chat to Deploy BEARDSHELL Malware and COVENANT in UkraineJune 24, 2025
• Russian hackers breach orgs to track aid routes to UkraineMay 21, 2025
• Russian Hackers Exploit Email and VPN Vulnerabilities to Spy on Ukraine Aid LogisticsMay 21, 2025
• Government webmail hacked via XSS bugs in global spy campaignMay 15, 2025
• Russia-Linked APT28 Exploited MDaemon Zero-Day to Hack Government Webmail ServersMay 15, 2025

Related Weaknesses

• CWE-79