Home / mailings

PDF

[USN-8323-1] Postorius vulnerability

Posted on 27 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8323-1
May 27, 2026

postorius vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Postorius could be made to expose sensitive information over the network.

Software Description:
- postorius: Django based management interface for Mailman

Details:

It was discovered that Postorius did not properly escape HTML in message
subjects when rendering the Held messages pop-up. An attacker could
possibly use this issue to inject arbitrary HTML, resulting in exposure
of sensitive information.

Update instructions:

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

Ubuntu 26.04 LTS
python3-django-postorius 1.3.13-1ubuntu1.1~26.04.1

Ubuntu 25.10
python3-django-postorius 1.3.13-1ubuntu1.1~25.10.1

Ubuntu 24.04 LTS
python3-django-postorius 1.3.10-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
python3-django-postorius 1.3.5-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
python3-django-postorius 1.2.4-1ubuntu0.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-django-postorius 1.1.2-3ubuntu0.1+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8323-1
CVE-2026-44742

Package Information:
https://launchpad.net/ubuntu/+source/postorius/1.3.13-1ubuntu1.1~26.04.1
https://launchpad.net/ubuntu/+source/postorius/1.3.13-1ubuntu1.1~25.10.1

--===============6741503140563649921==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

TOP