How severe is CVE-2026-4277?

CVE-2026-4277 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-4277 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4277?

CVE-2026-4277 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4277?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-4277 have an EU (EUVD) identifier?

Yes. CVE-2026-4277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19687.

When was CVE-2026-4277 published?

CVE-2026-4277 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-4277

CVE-2026-4277 is a critical-severity vulnerability in Djangoproject Django with a CVSS 3.x base score of 9.8. 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19687
Weakness: CWE-862
Affected product: Djangoproject Django
Published: 2026-04-07
Last modified: 2026-06-17

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. Add permissions on inline model instances were not validated on submission of forged `POST` data in `GenericInlineModelAdmin`. 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 N05ec@LZU-DSLab for reporting this issue.

Frequently asked questions

What is CVE-2026-4277?: An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. Add permissions on inline model instances were not validated on submission of forged `POST` data in `GenericInlineModelAdmin`. 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 N05ec@LZU-DSLab for reporting this issue.
How severe is CVE-2026-4277?: CVE-2026-4277 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-4277 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4277?: CVE-2026-4277 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4277?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-4277 have an EU (EUVD) identifier?: Yes. CVE-2026-4277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19687.
When was CVE-2026-4277 published?: CVE-2026-4277 was published on 2026-04-07 and last updated on 2026-06-17.

References

Affected products (1)

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

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