CVE Watch—

CVE-2020-35730

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

CVSS

—

No CVSS

EPSS

32.9%

p98

KEV

YES

Jun 22, 2023

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

32.7%EPSS · 30 days32.9%

2026-09-172026-10-15

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

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