{"id":"CVE-2020-13965","published":"2020-06-09T03:15:11Z","modified":"2026-06-17T02:54:01Z","title":"Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability","vendor":"Roundcube","product":"Webmail","tier":"core","eol":null,"description":{"text":"An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.","provenance":"source","from":"NVD"},"summary":{"text":"A cross-site scripting flaw in Roundcube Webmail before 1.3.12 and in 1.4.x before 1.4.5 lets malicious XML attachments execute script because text/xml is among the attachment types permitted for preview. An attacker who can send a crafted XML attachment to a user can run script in that user's webmail session, with the attack requiring the victim to open or preview the message.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-31T05:10:34Z"},"cvss":{"score":6.1,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.76596,"percentile":0.99542,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2024-06-26","dueDate":"2024-07-17","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12; https://nvd.nist.gov/vuln/detail/CVE-2020-13965","provenance":"source"},"vulncheckKev":{"dateAdded":"2024-06-26","exploitedFirstSeen":"2024-06-26","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2024-06-26"},{"url":"https://www.maverits.com/post/apt28-the-long-hand-of-russian-interests","date":"2025-01-25"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"id":"CWE-80","name":"Improper Neutralization of Script-Related HTML Tags in a Web Page"}],"references":[{"url":"https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-Roundcube","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5","tags":["Patch"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.3.12","tags":["Release Notes"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.4.5","tags":["Release Notes"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/","tags":["Mailing List"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/","tags":["Mailing List"]},{"url":"https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12","tags":["Vendor Advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4700","tags":["Third Party Advisory"]},{"url":"https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-Roundcube","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5","tags":["Patch"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.3.12","tags":["Release Notes"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.4.5","tags":["Release Notes"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/","tags":["Mailing List"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/","tags":["Mailing List"]},{"url":"https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12","tags":["Vendor Advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4700","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13965","tags":["US Government Resource"]}],"techniques":[{"id":"T1189","name":"Drive-by Compromise","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: victim previews malicious attachment, drive-by script execution","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"XSS via a malicious XML attachment","start":92,"end":126}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: XSS yields script execution in browser","mappingType":"primary_impact","evidence":[{"from":"description","quote":"There is XSS via a malicious XML attachment","start":83,"end":126}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-6139","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-6139","exploited":true,"exploitedSince":"2024-06-26","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2024-04-13","earliestUrl":"https://github.com/mbadanoiu/CVE-2020-13965","repos":[{"name":"mbadanoiu/CVE-2020-13965","url":"https://github.com/mbadanoiu/CVE-2020-13965","stars":0,"created":"2024-04-13"}]},"first":{"date":"2024-04-13","source":"PoC-in-GitHub","url":"https://github.com/mbadanoiu/CVE-2020-13965"},"provenance":"source"},"exploitRefs":["https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-Roundcube"],"flow":[{"stage":"exploitation","techniques":["T1189"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2020-06-09","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-13965","provenance":"source"},{"date":"2024-04-13","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/mbadanoiu/CVE-2020-13965","provenance":"source"},{"date":"2024-06-26","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","provenance":"source"},{"date":"2024-06-26","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2024-06-26","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-6139","provenance":"source"}],"speed":{"daysToPublicExploit":1404,"firstExploitFrom":"PoC-in-GitHub","daysToKev":1478},"priority":{"score":67.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 857 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.91,"detail":"percentile 0.9954"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":4.27,"detail":"base score 6.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-roundcube-webmail-cwe-79"}}