CVE Watch—

CVE-2020-35730

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

CVSS

—

No CVSS

EPSS

32.8%

p98

KEV

YES

Jun 22, 2023

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

32.8%EPSS · 30 days32.8%

2026-06-302026-07-16

KEV catalog record

Product

Roundcube / Roundcube Webmail

Vulnerability

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Added to KEV

Jun 22, 2023

Remediate by

Jul 13, 2023

Known ransomware use

Summary 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.

Required action

Apply updates per vendor instructions.

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 CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2020-12641—

99.7%

KEV—80Roundcube Webmail Remote Code Execution Vulnerability—CVE-2021-44026—

98.6%

KEV—80Roundcube Webmail SQL Injection Vulnerability—CVE-2017-16651—

98.3%

KEV—80Roundcube Webmail File Disclosure Vulnerability—