{"cve":"CVE-2020-12137","nvd":{"published":"2020-04-24T13:15:11.780","modified":"2026-06-17T02:51:28.203","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS","http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html","http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html","http://www.openwall.com/lists/oss-security/2020/04/24/3","https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html"],"products":["canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","gnu:mailman","opensuse:backports_sle","opensuse:leap"],"source":"nvd","synced_at":"2026-10-19T21:04:18.695612450+00:00"},"epss":{"cve":"CVE-2020-12137","score":0.02288,"percentile":0.83193,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}