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.
6.1
76.6%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Published
- Jun 9, 2020
- Modified
- Jun 17, 2026
- 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
Affected packages
Proof-of-concept & exploitation references
1 foundWeaponization
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.
References
How this class of flaw gets exploited
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 6.1 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 (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2020-13965?
We found 1 public GitHub repository referencing CVE-2020-13965, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2020-13965?
CVE-2020-13965 is classified under CWE-79, CWE-80.
Cross-checked against
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