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Vulnerabilities

Vulnerability · CVE-2020-35730

Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Published Dec 28, 2020 · catalog updated Jun 16, 2026 · Roundcube Roundcube Webmail

Patch now

CVE-2020-35730 is in the CISA known-exploited catalog, due Jul 13, 2023. 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
32.92%
Remediation
Remediation guidance
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe roundcube/webmail · vendor Roundcube Roundcube Webmail

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

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 linux9.0
  • cpe fedoraproject/fedora32
  • cpe fedoraproject/fedora33
  • cpe roundcube/webmailversion unspecified
  • vendor Roundcube Roundcube Webmailversion unspecified

How to fix CVE-2020-35730

What to do

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

Should you patch?

CVE-2020-35730 is in the CISA known-exploited catalog, due Jul 13, 2023. 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 9.0. Apply updates per vendor instructions.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 32.92%. 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. Dec 28, 2020 · Catalog

    Detected

    An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

  2. Jun 22, 2023 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Jul 13, 2023 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

Sources

  • CISA KEVConfirmed exploitationCVE-2020-35730

    Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows an attacker to send a plain text e-mail message with Javascript in a link reference element that is mishandled by linkref_addinindex in rcube_string_replacer.php.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-35730

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-35730

    30-day exploitation probability 32.9%

    first.org
  • NIST NVDVulnerability recordCVE-2020-35730

    An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2020-35730

    Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows an attacker to send a plain text e-mail message with Javascript in a link reference element that is mishandled by linkref_addinindex in rcube_string_replacer.php.

    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.