CVE-2023-31047: Django bypasses validation when using one form field to upload multiple files

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-07 · updated 2026-06-17
Weakness: CWE-20

Description

In Django 3.2 before 3.2.19, 4.x before 4.1.9, and 4.2 before 4.2.1, it was possible to bypass validation when using one form field to upload multiple files. This multiple upload has never been supported by forms.FileField or forms.ImageField (only the last uploaded file was validated). However, Django's "Uploading multiple files" documentation suggested otherwise.

Affected products

Django: from 3.2 before 3.2.19; from 4.0 before 4.1.9; 4.2, 4.2-b1, 4.2-rc1 — fixed in 3.2.19, 4.1.9
Fedoraproject Fedora: 38
Pypi Django: from 3.2 before 3.2.19; from 4.0 before 4.1.9; from 4.2 before 4.2.1; 3.2, 3.2.1, 3.2.10, 3.2.11, 3.2.12, 3.2.13 (+43) — fixed in 3.2.19, 4.1.9, 4.2.1

How to fix

Upgrade to a fixed version: Django 3.2.19, 4.1.9; Pypi Django 3.2.19, 4.1.9, 4.2.1. Check the vendor advisory for mitigations.

References

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