USN-8323-1: Postorius vulnerability

Publication date

27 May 2026

Overview

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


Packages

  • 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.

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

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
26.04 LTS resolute python3-django-postorius –  1.3.13-1ubuntu1.1~26.04.1
25.10 questing python3-django-postorius –  1.3.13-1ubuntu1.1~25.10.1
24.04 LTS noble python3-django-postorius –  1.3.10-1ubuntu0.1~esm1  
22.04 LTS jammy python3-django-postorius –  1.3.5-1ubuntu0.1~esm1  
20.04 LTS focal python3-django-postorius –  1.2.4-1ubuntu0.1+esm1  
18.04 LTS bionic python-django-postorius –  1.1.2-3ubuntu0.1+esm1  

Reduce your security exposure

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