Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
n/a — n/a
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.
6.1
58.5%
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
- Sep 22, 2023
- Modified
- Oct 21, 2025
- Added to KEV
- Feb 12, 2024
- Federal patch due
- Mar 4, 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-2023-43770, 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-2023-43770 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-2023-43770?
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.
How severe is CVE-2023-43770?
CVE-2023-43770 has a CVSS base score of 6.1 out of 10 (CVSS 3.1).
Is CVE-2023-43770 actively exploited in the wild?
Yes. CVE-2023-43770 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 12, 2024, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2023-43770?
58.5% - meaning FIRST.org's EPSS model estimates a 58.5% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
What type of vulnerability is CVE-2023-43770?
CVE-2023-43770 is classified under CWE-79 (CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
Cross-checked against
Impactr finds and proves whether CVE-2023-43770 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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