CVE-2020-13965

Name: CVE-2020-13965
Creator: NVD / NIST
Published: 2020-06-09T03:15:11.25+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10Actively ExploitedEPSS 76.60%

Last modified Jun 17, 2026

CVE-2020-13965 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.. CISA has confirmed active exploitation in the wild. EPSS estimates a 76.60% chance of exploitation in the next 30 days.

Description

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

76.60%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jul 17, 2024.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Roundcube	Webmail	< 1.3.12
Roundcube	Webmail	>= 1.4.0, < 1.4.5
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32

References

https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-RoundcubeExploit, Third Party Advisory
https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3Patch, Third Party Advisory
https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.3.12Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.4.5Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/Mailing List
https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12Vendor Advisory
https://www.debian.org/security/2020/dsa-4700Third Party Advisory
https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-RoundcubeExploit, Third Party Advisory
https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3Patch, Third Party Advisory
https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5Patch
https://github.com/roundcube/roundcubemail/releases/tag/1.3.12Release Notes
https://github.com/roundcube/roundcubemail/releases/tag/1.4.5Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/Mailing List
https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12Vendor Advisory
https://www.debian.org/security/2020/dsa-4700Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13965US Government Resource

Timeline

Published: Jun 9, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-13965?

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

How severe is CVE-2020-13965?

CVE-2020-13965 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 76.60% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-13965?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13965?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST