{"id":"CVE-2020-35730","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-35730","generatedAt":"2026-10-31T16:14:59.413Z","title":"Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability","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.","published":"2020-12-28T20:15:13.000Z","lastModified":"2026-06-17T03:14:12.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["roundcube/webmail","fedoraproject/fedora","debian/debian linux"],"epss":{"score":0.3292,"percentile":0.98354,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2023-06-22","dueDate":"2023-07-13","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://roundcube.net/news/2020/12/27/security-updates-1.4.10-1.3.16-and-1.2.13; https://nvd.nist.gov/vuln/detail/CVE-2020-35730"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 13 July 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491","tags":["Issue Tracking","Mailing List"],"source":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.2.13","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.3.16","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.4.10","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/","tags":["Mailing List","Release Notes"],"source":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/","tags":["Mailing List","Release Notes"],"source":"cve@mitre.org"},{"url":"https://roundcube.net/download/","tags":["Product"],"source":"cve@mitre.org"},{"url":"https://www.alexbirnberg.com/roundcube-xss.html","tags":["Broken Link"],"source":"cve@mitre.org"},{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=978491","tags":["Issue Tracking","Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/roundcube/roundcubemail/compare/1.4.9...1.4.10","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.2.13","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.3.16","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.4.10","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HCEU4BM5WGIDJWP6Z4PCH62ZMH57QYM2/","tags":["Mailing List","Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HMLIZWKMTRCLU7KZLEQHELS4INXJ7X5Q/","tags":["Mailing List","Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://roundcube.net/download/","tags":["Product"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.alexbirnberg.com/roundcube-xss.html","tags":["Broken Link"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-35730","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-35730","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}