Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe debian/debian linux10.0
• cpe debian/debian linux11.0
• cpe debian/debian linux12.0
• cpe fedoraproject/fedora39
• cpe roundcube/webmailversion unspecified
• vendor Roundcube Roundcube Webmailversion unspecified
• vendor Roundcube Webmailversion unspecified

How to fix CVE-2023-5631

• Recommended remediation

  Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA due date Nov 16, 2023.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Oct 18, 2023 · Catalog

   Detected

   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.

2. Oct 26, 2023 · CISA KEV

   Known exploited

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

3. Nov 16, 2023 · CISA KEV

   Remediation due

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

4. Jun 16, 2026 · Catalog

   Updated

   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.

Sources

• CISA KEVConfirmed exploitationCVE-2023-5631

  Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.

  cisa.gov
• CVE.orgVulnerability recordCVE-2023-5631

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2023-5631

  30-day exploitation probability 75.9%

  first.org
• NIST NVDVulnerability recordCVE-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 to load arbitrary JavaScript code.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2023-5631

  Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that allows a remote attacker to run malicious JavaScript code.

  vulncheck.com

References

• Mailing List · openwall.com
• Mailing List · openwall.com
• Mailing List · openwall.com
• Mailing List · bugs.debian.org
• VulnCheck exploitation evidence · cofense.com
• VulnCheck exploitation evidence · dd80b675424c132b90b3-e48385e382d2e5d17821a5e1d8e4c86b.ssl.cf1.rackcdn.com
• Patch · github.com
• Patch · github.com
• Exploit · github.com
• Release Notes · github.com
• VulnCheck exploitation evidence · go.recordedfuture.com
• CISA note · nvd.nist.gov
• CISA note · roundcube.net
• CISA note · roundcube.net
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · rewterz.com
• VulnCheck exploitation evidence · welivesecurity.com

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.