# CVE-2021-40347: python-django-postorius: An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5

CVE-2021-40347 is fixed in 2 products on 1 platform, first by python-django-postorius 1.1.2-3ubuntu0.1, released September 10, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-40347
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0121
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 10, 2021

## Description

An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-django-postorius Ubuntu 18.04.6 LTS (bionic) | 1.1.2-3ubuntu0.1 | [python-django-postorius 1.1.2-3ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-django-postorius-1.1.2-3ubuntu0.1.md) | Sep 10, 2021 |
| Linux | python3-django-postorius Ubuntu 20.04 LTS (focal) | 1.2.4-1ubuntu0.1 | [python3-django-postorius 1.2.4-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-django-postorius-1.2.4-1ubuntu0.1.md) | Sep 10, 2021 |
| Linux | python3-django-postorius Ubuntu 22.04.1 LTS (jammy) | 1.3.5-1 | [python3-django-postorius 1.3.5-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-django-postorius-1.3.5-1.md) | Sep 10, 2021 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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