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Fencer Intel
high 7.5

CVE-2012-4520 json

Django Allows Arbitrary URL Generation

published 2012-11-18 13 y ago modified 2026-06-16 4 mo ago also GHSA-2655-q453-22f9 , PYSEC-2012-7 , EUVD-2012-0006

cvss
7.5
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The django.http.HttpRequest.get_host function in Django 1.3.x before 1.3.4 and 1.4.x before 1.4.2 allows remote attackers to generate and display arbitrary URLs via crafted username and password Host header values.

Patch / fix

  • pypi django 1.3.4, 1.4.2
  • python-django Debian 14, Debian 13, Debian 12 1.4.2-1

debian advisories DEBIAN-CVE-2012-4520

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-4520 updated cvss 4.3

Django: Host header poisoning vulnerability

  • Red Hat Subscription Asset Manager Django
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.74% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi django
>=1.3, <1.3.4
>=1.4, <1.4.2
1.3.4
1.4.2

Classification

Weakness
  • CWE-20 Improper Input Validation
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.