CVE Watch—

CVE-2023-5631

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

CVSS

—

No CVSS

EPSS

75.9%

p99

KEV

YES

Oct 26, 2023

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

73.4%EPSS · 30 days75.9%

2026-06-302026-07-16

KEV catalog record

Product

Roundcube / Webmail

Vulnerability

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Added to KEV

Oct 26, 2023

Remediate by

Nov 16, 2023

Known ransomware use

Summary 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.

Notes

https://roundcube.net/news/2023/10/16/security-update-1.6.4-released, https://roundcube.net/news/2023/10/16/security-updates-1.5.5-and-1.4.15 ; https://nvd.nist.gov/vuln/detail/CVE-2023-5631

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2025-49113—

99.8%

KEV—80RoundCube Webmail Deserialization of Untrusted Data Vulnerability—CVE-2024-42009—

99.7%

KEV—80RoundCube Webmail Cross-Site Scripting Vulnerability—CVE-2020-13965—

99.5%

KEV—80Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability—CVE-2024-37383—

99.4%

KEV—80RoundCube Webmail Cross-Site Scripting (XSS) Vulnerability—CVE-2023-43770—

99.0%

KEV—80Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability—CVE-2025-68461—

97.1%

KEV—79RoundCube Webmail Cross-site Scripting Vulnerability—