Ubuntu Security Notices USN-8067-1 USN-8067-1: Mailman vulnerability Publication date 2 March 2026 Overview A system hardening measure could be bypassed. Releases 20.04 LTS 16.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages mailman - Web-based mailing list manager Details It was discovered that Mailman incorrectly handled CSRF tokens. A remote list member or moderator could possibly use their own token to craft an admin request CSRF attack and set a new admin password or make other changes. It was discovered that Mailman incorrectly handled CSRF tokens. A remote list member or moderator could possibly use their own token to craft an admin request CSRF attack and set a new admin password or make other changes. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 20.04 LTS focal mailman – 1:2.1.29-1ubuntu3.1+esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 16.04 LTS xenial mailman – 1:2.1.20-1ubuntu0.6+esm3 Ubuntu Pro Fix available with Ubuntu Pro . Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2021-44227 CVE-2021-44227 Related notices USN-5180-1 USN-5180-1