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Ubuntu 20.04 Mailman Notable CSRF Bypass Flaw USN-8067-1

ubuntu
Calendar Grey March 2, 2026
Dist Ubuntu Esm H88
A hardening measure in Ubuntu's Mailman can be bypassed, allowing unauthorized access. Update promptly to secure systems.
A system hardening measure could be bypassed.

Summary

A system hardening measure could be bypassed.

Software Description:

- 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.

Topics%20covered

Topics Covered

security advisory Ubuntu important mailman bypass CSRF

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
  mailman                         1:2.1.29-1ubuntu3.1+esm2
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  mailman                         1:2.1.20-1ubuntu0.6+esm3
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8067-1

CVE-2021-44227

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8067-1

Topics%20covered

Topics Covered

security advisory Ubuntu important mailman bypass CSRF

Package Information

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