{"id":"CVE-2023-43770","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-43770","generatedAt":"2026-10-31T10:23:19.779Z","title":"Roundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability","description":"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.","published":"2023-09-22T06:15:10.000Z","lastModified":"2026-06-17T06:26:25.000Z","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","debian/debian linux"],"epss":{"score":0.6366,"percentile":0.99215,"date":"2026-10-30","history":[{"date":"2026-09-23","score":0.6366,"percentile":0.9918}]},"kev":{"listed":true,"dateAdded":"2024-02-12","dueDate":"2024-03-04","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.\nhttps://roundcube.net/news/2023/09/15/security-update-1.6.3-released ;  https://nvd.nist.gov/vuln/detail/CVE-2023-43770"},"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 4 March 2024). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-23T00:00:00.000Z","detail":{"to":0.6366,"from":0.58483,"percentile":0.9918},"summary":"EPSS moved from 58.5% to 63.7% probability of exploitation in the next thirty days."}],"references":[{"url":"https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html","tags":["Mailing List"],"source":"cve@mitre.org"},{"url":"https://roundcube.net/news/2023/09/15/security-update-1.6.3-released","tags":["Release Notes"],"source":"cve@mitre.org"},{"url":"https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html","tags":["Mailing List"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://roundcube.net/news/2023/09/15/security-update-1.6.3-released","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-43770","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."}