7.5

CVE-2026-3902: djangoproject django Authentication Bypass by Spoofing

CVSS: 7.5v3.1HighAnalyzed
AliasesGHSA-mvfq-ggxm-9mc5BIT-django-2026-3902PYSEC-2026-51
Published 07-04-2026Last modified 07-04-2026
Open JSON

Vulnerability summary

CVE-2026-3902 is a high (CVSS 7.5) Authentication Bypass by Spoofing vulnerability in djangoproject django. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 44.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 7
MGASA-2026-0093OPENSUSE-SU-2026:10516-1OPENSUSE-SU-2026:10517-1OPENSUSE-SU-2026:10567-1OPENSUSE-SU-2026:11270-1OPENSUSE-SU-2026:20578-1

Timeline

  1. 07-04-2026
    PublishedVulnerability first disclosed.
  2. 07-04-2026
    Last modifiedVulnerability information updated.

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 metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.11 pp

From 0.44% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.55%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • authentik-2025.12< 2025.12.4-r3
  • authentik-2026.2< 2026.2.1-r3
  • authentik-fips-2025.12< 2025.12.4-r3
  • authentik-fips-2026.2< 2026.2.1-r3
  • awx< 24.6.1-r34
Debian1 product
  • python-djangoAll versions (No fix recorded) | < 3:4.2.30-1
Djangoproject1 product
  • django≥ 4.2, < 4.2.30 | ≥ 5.2, < 5.2.13 | ≥ 6.0, < 6.0.4
PyPI1 product
  • django≥ 5.2, < 5.2.13 | ≥ 4.2, < 4.2.30 | ≥ 6.0, < 6.0.4
Ubuntu1 product
  • python-django< 2:3.2.12-2ubuntu1.26 | < 3:4.2.11-1ubuntu1.15 | < 3:5.2.4-1ubuntu2.4

5 vendors · 10 products

References

16 links
Show all 16 references