CVE-2023-43770
Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 March 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 63.66% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 12 February 2024 · due 4 March 2024
- Weakness
- CWE-79
- Affected
- roundcube/webmail · debian/debian linux
- Source
- cve@mitre.org
EPSS moved from 63.7% on 23 September 2026 to 63.7% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. https://roundcube.net/news/2023/09/15/security-update-1.6.3-released ; https://nvd.nist.gov/vuln/detail/CVE-2023-43770
References
- https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49bPatch
- https://lists.debian.org/debian-lts-announce/2023/09/msg00024.htmlMailing List
- https://roundcube.net/news/2023/09/15/security-update-1.6.3-releasedRelease Notes
- https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49bPatch
- https://lists.debian.org/debian-lts-announce/2023/09/msg00024.htmlMailing List
- https://roundcube.net/news/2023/09/15/security-update-1.6.3-releasedRelease Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.