XSS in Roundcube Roundcubemail

CVE-2023-5631

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 t…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.832 (99.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-5631?
CVE-2023-5631 is a medium-severity vulnerability in Roundcube Roundcubemail, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-10-18.
How severe is CVE-2023-5631?
Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-5631 known to be exploited?
Yes. CVE-2023-5631 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-26), indicating it is being actively exploited. 9 public proof-of-concept repositories are indexed.