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    CVE-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.

    Published:Dec 28, 2020
    Last Modified:Nov 4, 2025
    EPS:Dec 28, 2020
    EPSS Score:0.64254
    CVSS Score:6.1

    CISA Notification

    Description

    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.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Jul 13, 2023
    1156 days ago
    Alert Date
    Jun 22, 2023
    1177 days ago

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Roundcube
    Product
    Webmail

    Exploits

    https://github.com/skyllpro/CVE-2021-44026-PoC

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    References

    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
    https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
    https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
    https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
    https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/
    https://roundcube.net/download/
    https://www.alexbirnberg.com/roundcube-xss.html
    https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491
    https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10
    https://github.com/roundcube/roundcubemail/releases/tag/1.2.13
    https://github.com/roundcube/roundcubemail/releases/tag/1.3.16
    https://github.com/roundcube/roundcubemail/releases/tag/1.4.10
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/
    https://roundcube.net/download/
    https://www.alexbirnberg.com/roundcube-xss.html
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High