Open Object API lets tokens read objects of other object types
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
Open Object by maykinmedia is affected from 2.4.3 before 2.5.1, from 3.0.0 before 3.6.2, from 4.0.0-rc.1 before 4.0.2 and from 4.1.0 before 4.1.1. An authorization bypass (CWE-639) on the history-detail endpoint lets a token with read access to one object type read the full versioned data of objects of other object types. Any valid non-superuser API token with a read grant can exploit it, exposing records such as citizen or case data in government deployments.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
Open Object provides an API and admin interface to manage objects and object types. From 2.4.3 until 2.5.1, 3.6.2, 4.0.2, and 4.1.1, a token scoped to read one ObjectType can read the full versioned record of an object of any other ObjectType via the history-detail endpoint `GET /api/v2/objects/{uuid}/{index}`. The `history_detail` action in `src/objects/api/v2/views.py` calls `self.get_queryset()` and `get_object_or_404` directly instead of `self.get_object()`, so `check_object_permissions` and the per-object check in `ObjectTypeBasedPermission.has_object_permission` are not invoked. The queryset's `filter_for_token` applies only to the list and search actions, while `ObjectTypeBasedPermission.has_permission` allows non-create actions, leaving neither check to constrain history-detail records to the token's permitted ObjectType. The normal retrieve endpoint returns 403 for the same unauthorized object, and the sibling history action enforces the grant. Any valid non-superuser API token with a read grant on at least one ObjectType can therefore disclose another ObjectType's complete versioned object `data`, which can include citizen or case records and sensitive identifiers in government deployments. This issue is fixed in versions 2.5.1, 3.6.2, 4.0.2, and 4.1.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| open-formulieren | open-object | 2.4.3 to before 2.5.1; 3.0.0 to before 3.6.2; 4.0.0-rc.1 to before 4.0.2; 4.1.0 to before 4.1.1 | 2.5.1, 3.6.2, 4.0.2, 4.1.1 | Patch available | CNA |
- open-object Vendoropen-formulieren Affected 2.4.3 to before 2.5.1; 3.0.0 to before 3.6.2; 4.0.0-rc.1 to before 4.0.2; 4.1.0 to before 4.1.1 Fixed in 2.5.1, 3.6.2, 4.0.2, 4.1.1 Patch available CNA
Remediation
Upgrade Open Object to version 2.5.1, 3.6.2, 4.0.2 or 4.1.1, depending on the release line in use.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA open-object (maykinmedia) Fixed in 2.5.1, 3.6.2, 4.0.2, 4.1.1
Timeline
- 2026-10-28 Threatist record created from CVE-2026-82411
- 2026-10-29 CISA SSVC decision points changed
- 2026-10-29 Priority changed: MEDIUM → LOW
References
Other 9
- https://github.com/maykinmedia/open-object/security/advisories/GHSA-55w6-rqp5-j5wx
- https://github.com/maykinmedia/open-object/commit/11c5b85ea5d1d80f940883f01b8b8ea80ccdd47c
- https://github.com/maykinmedia/open-object/commit/27e806eff04c52ebe1e78126c288b63fc0308b52
- https://github.com/maykinmedia/open-object/commit/6154d9c2ed8c162b61f2d42db2de4eda5081347f
- https://github.com/maykinmedia/open-object/commit/ce6b1820619c843748bc5231597aa7fc060d95fe
- https://github.com/maykinmedia/open-object/tree/2.5.1
- https://github.com/maykinmedia/open-object/tree/3.6.2
- https://github.com/maykinmedia/open-object/tree/4.0.2
- https://github.com/maykinmedia/open-object/tree/4.1.1
More open-formulieren vulnerabilities
- TI-2024-16288 Open Forms potential multi-factor authentication bypass CVSS 3.1HIGH 7.7
- TI-2022-13086 Insufficient content-type validation for uploaded files in open-forms CVSS 3.1HIGH 7.6
- TI-2022-13085 Open Redirect in open-forms CVSS 3.1HIGH 7.1
- TI-2026-22997 Open Forms possible to view submission details of other people than intended CVSS 3.1MEDIUM 6.5
- TI-2025-39905 Open Forms prefill data in read-only components can be tampered CVSS 3.1MEDIUM 4.3
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences