CVE-2020-35730

As of 2025-11-04, CVE-2020-35730 is a CVSS 6.1 (MEDIUM-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 64.8%. Threadlinqs Intelligence tracks 1 threat exploiting it.

Last updated: 2025-11-04

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 v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

Exploitation status

CISA KEV-listed (known exploited)

Threats tracking this CVE

• APT28/UAC-0001 Sustained Cyber Espionage Against Ukraine & EU (2024-2026 New TTPs) — HIGH

References

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
• https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
• https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
• https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
• https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/
• https://roundcube.net/download/
• https://www.alexbirnberg.com/roundcube-xss.html
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.