CVE-2020-13965 — Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
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.
Published
2020-06-09T02:45:24.000Z
Last modified
2025-10-21T23:35:42.715Z
CISA KEV — Actively Exploited
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Yes — actively exploited. Added to the CISA KEV catalog on 2024-06-26. Ransomware use: Unknown.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:
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07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-06-09T02:45:24.000Z
- Last modified: 2025-10-21T23:35:42.715Z
- Added to CISA KEV: 2024-06-26
- BOD 22-01 due: 2024-07-17
09References
- github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.4.5
- github.com — https://github.com/roundcube/roundcubemail/releases/tag/1.3.12
- github.com — https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009eb…
- github.com — https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5
- roundcube.net — https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12
- www.debian.org — https://www.debian.org/security/2020/dsa-4700
- lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
- lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
- github.com — https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20…
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