CVE-2023-43770
Medium 6.1 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.
Metrics
- CVSS 3.1
-
6.1 (MEDIUM)
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 64% (percentile: 99) as of 2 November 2026
- CWE
- CWE-79
Affected products
roundcube: webmail; debian: debian linux
References
- https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530c… Patch
- https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530c… Patch
- https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html Mailing List
- https://roundcube.net/news/2023/09/15/security-update-1.6.3-released Release Notes
- https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html Mailing List
- https://roundcube.net/news/2023/09/15/security-update-1.6.3-released Release Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023… US Government Resource