October 26, 2023 · Applied Cybernetics Group
CVE-2023-5631 Roundcube Webmail
Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
- Added to KEV
2023-10-26- Federal due date
2023-11-16- Vendor
- Roundcube
- Product
- Webmail
- EPSS
- 99.5th percentile (score 0.763, as of
2026-11-06) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1041 , T1059.007 , T1204.001 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-5631
CISA short description
Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.