CVE-2020-35730

MEDIUM6.1

CISA KEV

Published 2020-12-28 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2020-35730 is a medium-severity (CVSS 6.1) vulnerability in Roundcube Roundcube Webmail. CISA added it to the Known Exploited Vulnerabilities catalog on June 22, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 13, 2023. CISA does not currently list it as used in ransomware campaigns. Roundcube has 11 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 11 known-exploited Roundcube vulnerabilities →

Description

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 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-79CWE-79

CISA Known-Exploited Vulnerability

Product: Roundcube — Roundcube Webmail

Name: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Date added: 2023-06-22 · Due: 2023-07-13

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Roundcube vulnerabilities

Most recently added to CISA KEV

CVE-2025-49113
Webmail — RoundCube Webmail Deserialization of Untrusted Data Vulnerability
added 2026-02-20
CVE-2025-68461
Webmail — RoundCube Webmail Cross-site Scripting Vulnerability
added 2026-02-20
CVE-2024-42009
Webmail — RoundCube Webmail Cross-Site Scripting Vulnerability
added 2025-06-09
CVE-2024-37383
Webmail — RoundCube Webmail Cross-Site Scripting (XSS) Vulnerability
added 2024-10-24
CVE-2020-13965
Webmail — Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
added 2024-06-26
CVE-2023-43770
Webmail — Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
added 2024-02-12

View all →

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