CVE-2023-5631

MEDIUM6.1

CISA KEV

Published 2023-10-18 · Updated 2026-06-17 · Source security@eset.com

Summary

CVE-2023-5631 is a medium-severity (CVSS 6.1) vulnerability in Roundcube Webmail. CISA added it to the Known Exploited Vulnerabilities catalog on October 26, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 16, 2023. CISA does not currently list it as used in ransomware campaigns. Roundcube has 11 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 11 known-exploited Roundcube vulnerabilities →

Description

Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attacker to load arbitrary JavaScript code.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-79CWE-79

CISA Known-Exploited Vulnerability

Product: Roundcube — Webmail

Name: Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Date added: 2023-10-26 · Due: 2023-11-16

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited Roundcube vulnerabilities

Most recently added to CISA KEV

CVE-2025-49113
Webmail — RoundCube Webmail Deserialization of Untrusted Data Vulnerability
added 2026-02-20
CVE-2025-68461
Webmail — RoundCube Webmail Cross-site Scripting Vulnerability
added 2026-02-20
CVE-2024-42009
Webmail — RoundCube Webmail Cross-Site Scripting Vulnerability
added 2025-06-09
CVE-2024-37383
Webmail — RoundCube Webmail Cross-Site Scripting (XSS) Vulnerability
added 2024-10-24
CVE-2020-13965
Webmail — Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability
added 2024-06-26
CVE-2023-43770
Webmail — Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
added 2024-02-12

View all →

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