Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
n/a — n/a
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.
6.3
76.6%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- Published
- Jun 9, 2020
- Modified
- Oct 21, 2025
- Added to KEV
- Jun 26, 2024
- Federal patch due
- Jul 17, 2024
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2020-13965, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2020-13965 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
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 base score of 6.3 out of 10 (CVSS 3.1).
Is CVE-2020-13965 actively exploited in the wild?
Yes. CVE-2020-13965 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 26, 2024, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2020-13965?
76.6% - meaning FIRST.org's EPSS model estimates a 76.6% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
What type of vulnerability is CVE-2020-13965?
CVE-2020-13965 is classified under CWE-80 (CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)).
Cross-checked against
Impactr finds and proves whether CVE-2020-13965 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
Join the waitlist