What’s Vulnerable › Vulnerabilities

CVE-2020-13964

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-09 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. include/rcmail_output_html.php allows XSS via the username template object.

Affected products

• Debian Linux: 9.0, 10.0
• Fedoraproject Fedora: 31, 32
• Roundcube Webmail: before 1.3.12; from 1.4.0 before 1.4.5 — fixed in 1.3.12, 1.4.5

How to fix

Upgrade to a fixed version: Roundcube Webmail 1.3.12, 1.4.5. Check the vendor advisory for mitigations.

References

• https://github.com/roundcube/roundcubemail/commit/37e2bc745723ef6322f0f785aefd0b9313a40f19
• https://github.com/roundcube/roundcubemail/releases/tag/1.3.12
• https://github.com/roundcube/roundcubemail/releases/tag/1.4.5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/
• https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12
• https://www.debian.org/security/2020/dsa-4700
• https://github.com/roundcube/roundcubemail/commit/37e2bc745723ef6322f0f785aefd0b9313a40f19
• https://github.com/roundcube/roundcubemail/releases/tag/1.3.12
• https://github.com/roundcube/roundcubemail/releases/tag/1.4.5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/

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