How severe is CVE-2026-8404?

CVE-2026-8404 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-8404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-8404?

CVE-2026-8404 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-8404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-8404 have an EU (EUVD) identifier?

Yes. CVE-2026-8404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34088.

When was CVE-2026-8404 published?

CVE-2026-8404 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-8404

CVE-2026-8404 is a low-severity vulnerability in Djangoproject Django with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-178.

Key facts

Severity: Low (CVSS 3.x base score 3.1)
CVSS v4: 2.3
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34088
Weakness: CWE-178
Affected product: Djangoproject Django
Published: 2026-06-03
Last modified: 2026-06-17

Description

An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.middleware.cache.UpdateCacheMiddleware` in Django does not match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values. 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 Ahmed Badawe for reporting this issue.

Frequently asked questions

What is CVE-2026-8404?: An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.middleware.cache.UpdateCacheMiddleware` in Django does not match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values. 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 Ahmed Badawe for reporting this issue.
How severe is CVE-2026-8404?: CVE-2026-8404 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-8404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-8404?: CVE-2026-8404 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-8404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-8404 have an EU (EUVD) identifier?: Yes. CVE-2026-8404 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34088.
When was CVE-2026-8404 published?: CVE-2026-8404 was published on 2026-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*

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