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Vulnerability record · CVE-2020-12137 · published 24 April 2020

CVE-2020-12137: Gnu mailman cross-site scripting vulnerability

Gnu · Mailman

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.

6.1 CVSS 3.1 Medium EPSS 2.3% · top 17.5% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/24/3 Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZD
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJU
https://usn.ubuntu.com/4348-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4664 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/24/2 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/24/3 Mailing ListThird Party Advisory
http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/24/3 Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YCMGTTOXXCVM4O6CYZLTZD
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4COSBBEMJYLV7WSW5QTUJU
https://usn.ubuntu.com/4348-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4664 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/24/2 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/24/3 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-12137), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.