CVE-2023-5631 Roundcube Webmail Persistent Cross-Site Scripting (XSS)

What is CVE-2023-5631?

CVE-2023-5631 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 18 Oct 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2023-5631?

1 open source package ship an affected version, including roundcube. It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Roundcube Webmail.

How do I fix CVE-2023-5631?

Upgrade roundcube to a fixed version for your release line: 1.4.15, 1.5.5 or 1.6.4. US federal agencies must fix it by 16 Nov 2023.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2023-5631 being exploited?

Yes. Attackers have exploited CVE-2023-5631 in the wild since at least 26 Oct 2023.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-roundcube-2023-5631, CVE-2023-46267, DEBIAN-CVE-2023-5631, DLA-3630-1, DSA-5531-1, GHSA-qf8f-27cp-gw76 and 3 more.