CVE-2020-12137

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.

• CWE-79

• http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWSThird Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.htmlMailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/04/24/3Mailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00002.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZDX6YLYORNF/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJUOFJFK47KK/
• https://usn.ubuntu.com/4348-1/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4664Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/02/24/2Mailing List, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/02/24/3Mailing List, Third Party Advisory
• http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWSThird Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.htmlMailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/04/24/3Mailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/05/msg00002.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZDX6YLYORNF/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJUOFJFK47KK/
• https://usn.ubuntu.com/4348-1/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4664Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/02/24/2Mailing List, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/02/24/3Mailing List, Third Party Advisory

Published

Apr 24, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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