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Vulnerabilities

Vulnerability · CVE-2023-43770

Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability

Published Sep 21, 2023 · catalog updated Jun 16, 2026 · Roundcube Roundcube Webmail

Patch now

CVE-2023-43770 is in the CISA known-exploited catalog, due Mar 4, 2024. Confirm Roundcube Roundcube Webmail against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
63.66%
Remediation
Remediation guidance
Affected products
cpe debian/debian linux · cpe roundcube/webmail · vendor Roundcube Roundcube Webmail · vendor Roundcube Webmail

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

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 roundcube/webmailversion unspecified
  • vendor Roundcube Roundcube Webmailversion unspecified
  • vendor Roundcube Webmailversion unspecified

How to fix CVE-2023-43770

What to do

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

Should you patch?

CVE-2023-43770 is in the CISA known-exploited catalog, due Mar 4, 2024. Confirm Roundcube Roundcube Webmail against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 63.66%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

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

Timeline

Detection, updates, and resolution for this record.

  1. Sep 21, 2023 · Catalog

    Detected

    Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

  2. Feb 12, 2024 · CISA KEV

    Known exploited

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

  3. Mar 4, 2024 · 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 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-43770

    Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-43770

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-43770

    30-day exploitation probability 63.7%

    first.org
  • NIST NVDVulnerability recordCVE-2023-43770

    Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2023-43770

    Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.

    vulncheck.com

References

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.