{"id":"UBUNTU-CVE-2020-12137","details":"GNU Mailman 2.x before 2.1.30 uses the .obj extension for scrubbed application/octet-stream MIME parts. This behavior may contribute to XSS attacks against list-archive visitors, because an HTTP reply from an archive web server may lack a MIME type, and a web browser may perform MIME sniffing, conclude that the MIME type should have been text/html, and execute JavaScript code.","modified":"2026-02-04T02:23:07.421935Z","published":"2020-04-24T13:15:00Z","related":["USN-4348-1","USN-5121-2"],"upstream":["CVE-2020-12137"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-12137"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2020/02/24/2"},{"type":"REPORT","url":"http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/revision/1801"},{"type":"REPORT","url":"http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2020/04/24/3"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2020/02/24/3"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4348-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5121-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-12137"}],"affected":[{"package":{"name":"mailman","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/mailman@1:2.1.20-1ubuntu0.4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.1.20-1ubuntu0.4"}]}],"versions":["1:2.1.20-1","1:2.1.20-1ubuntu0.1","1:2.1.20-1ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"mailman","binary_version":"1:2.1.20-1ubuntu0.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12137.json"}},{"package":{"name":"mailman","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/mailman@1:2.1.26-1ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.1.26-1ubuntu0.1"}]}],"versions":["1:2.1.23-1","1:2.1.24-1","1:2.1.25-1","1:2.1.26-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"mailman","binary_version":"1:2.1.26-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12137.json"}},{"package":{"name":"mailman","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/mailman@1:2.1.29-1ubuntu3.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.1.29-1ubuntu3.1"}]}],"versions":["1:2.1.29-1","1:2.1.29-1build1","1:2.1.29-1ubuntu3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1:2.1.29-1ubuntu3.1","binary_name":"mailman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12137.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}