What is CVE-2026-3902?

CVE-2026-3902 is a high-severity vulnerability in Djangoproject Django, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2026-04-07.

How severe is CVE-2026-3902?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Djangoproject Django

CVE-2026-3902

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…

EPSS: 0.004 (35.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Djangoproject Django — versions 6.0, 6.0.4, 5.2

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Release Notes)
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-3902?: CVE-2026-3902 is a high-severity vulnerability in Djangoproject Django, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2026-04-07.
How severe is CVE-2026-3902?: High severity. CVSS v3 base score is 7.5 out of 10.