CVE-2026-87975 (GCVE-0-2026-87975)
Vulnerability from cvelistv5 – Published: 2026-10-06 13:35 – Updated: 2026-10-06 13:53
VLAI
EPSS
VEX
Title
Privilege abuse in model formsets with editable primary keys
Summary
An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18.
`django.forms.models.BaseModelFormSet.save_existing_objects()` used the presence of a primary key on a submitted form's instance as evidence that the instance belonged to the formset's limiting queryset. An object outside that queryset is represented by a newly constructed instance whose primary key can still be populated from submitted data when the model's primary key is a field accepted by the form, such as a `OneToOneField` or parent link used as the primary key of an inline formset's model, or a natural or UUID primary key included in the form's fields. This allows an authenticated user permitted to submit such a formset to delete rows outside the limiting queryset, without any permission on the targeted object, via forged management-form data marking an out-of-queryset object for deletion. Models using the default AutoField primary key are not affected.
Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected.
Django would like to thank Seonggwon Yoon for reporting this issue.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 13:51 UTC
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
7 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| djangoproject | Django |
Affected:
6.1 , < 6.1.2
(python)
Unaffected: 6.1.2 (python) Affected: 6.0 , < 6.0.9 (python) Unaffected: 6.0.9 (python) Affected: 5.2 , < 5.2.18 (python) Unaffected: 5.2.18 (python) |
guessed |
Date Public
2026-10-06 08:00
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"value": "An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18.\n`django.forms.models.BaseModelFormSet.save_existing_objects()` used the presence of a primary key on a submitted form\u0027s instance as evidence that the instance belonged to the formset\u0027s limiting queryset. An object outside that queryset is represented by a newly constructed instance whose primary key can still be populated from submitted data when the model\u0027s primary key is a field accepted by the form, such as a `OneToOneField` or parent link used as the primary key of an inline formset\u0027s model, or a natural or UUID primary key included in the form\u0027s fields. This allows an authenticated user permitted to submit such a formset to delete rows outside the limiting queryset, without any permission on the targeted object, via forged management-form data marking an out-of-queryset object for deletion. Models using the default AutoField primary key are not affected.\nEarlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected.\nDjango would like to thank Seonggwon Yoon for reporting this issue."
}
],
"impacts": [
{
"capecId": "CAPEC-122",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-122: Privilege Abuse"
}
]
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://docs.djangoproject.com/en/dev/internals/security/#security-issue-severity-levels",
"value": "moderate"
},
"type": "Django severity rating"
}
},
{
"cvssV3_1": {
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
},
{
"cvssV4_0": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-06T13:35:59.505Z",
"orgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
"shortName": "DSF"
},
"references": [
{
"name": "Django security archive",
"tags": [
"vendor-advisory"
],
"url": "https://docs.djangoproject.com/en/dev/releases/security/"
},
{
"name": "Django releases announcements",
"tags": [
"mailing-list"
],
"url": "https://groups.google.com/g/django-announce"
},
{
"tags": [
"patch"
],
"url": "https://github.com/django/django/commit/83cbd21be57483e6b3eb6e4688a561c841aff75e"
},
{
"tags": [
"patch"
],
"url": "https://github.com/django/django/commit/cce6c57ed30ea83725f9d6abb2fe5ee932bab107"
},
{
"tags": [
"patch"
],
"url": "https://github.com/django/django/commit/b83ab92bc5474558b083a840ea4628b3261b2cfe"
},
{
"tags": [
"patch"
],
"url": "https://github.com/django/django/commit/ff27883ca055aa9ab23015b50674a5b10dfe5a41"
},
{
"name": "Django security releases issued: 6.1.2, 6.0.9, and 5.2.18",
"tags": [
"vendor-advisory"
],
"url": "https://www.djangoproject.com/weblog/2026/oct/06/security-releases/"
}
],
"source": {
"discovery": "EXTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2026-09-02T00:00:00.000Z",
"value": "Initial report received."
},
{
"lang": "en",
"time": "2026-09-16T00:00:00.000Z",
"value": "Vulnerability confirmed."
},
{
"lang": "en",
"time": "2026-10-06T08:00:00.000Z",
"value": "Security release issued."
}
],
"title": "Privilege abuse in model formsets with editable primary keys",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92",
"assignerShortName": "DSF",
"cveId": "CVE-2026-87975",
"datePublished": "2026-10-06T13:35:59.505Z",
"dateReserved": "2026-09-09T18:18:45.075Z",
"dateUpdated": "2026-10-06T13:53:32.999Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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