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Vulnerability record · CVE-2026-3902 · published 7 April 2026

CVE-2026-3902: Djangoproject django authentication bypass by spoofing vulnerability

Djangoproject · Django

An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `ASGIRequest` allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Tarek Nakkouch for reporting this issue.

7.5 CVSS 3.1 High EPSS 0.55% · top 56.3% CWE-290 · Authentication bypass by spoofing
7.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `ASGIRequest` allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Tarek Nakkouch for reporting this issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.djangoproject.com/en/dev/releases/security/ PatchVendor Advisory
https://groups.google.com/g/django-announce Release Notes
https://www.djangoproject.com/weblog/2026/apr/07/security-releases/ PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-3902), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.