CVE-2026-105637: CWE-639: Authorization Bypass Through User-Controlled Key in makeplane plane
Description
Plane is an open-source project management tool. Prior to 1.4.0, ProjectBulkAssetEndpoint.post in apps/api/plane/app/views/asset/v2.py retrieves assets using id__in=asset_ids and workspace__slug=slug but does not constrain the query with project_id from the URL. A workspace Guest can provide asset UUIDs from another project in the same workspace and reassign their issue_id, comment_id, page_id, draft_issue_id, or project_id to an entity the attacker controls. Plane then treats the attacker's project as the new owner and provides a presigned download URL for the hijacked file. This issue is fixed in 1.4.0.
CVSS v3.1
Score 9.6critical
Affected software
makeplane
plane
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Plane versions before 1.4.0 contain an authorization bypass vulnerability (CWE-639) in the ProjectBulkAssetEndpoint.post method. The endpoint retrieves assets filtered by asset IDs and workspace slug but fails to constrain the query by project_id from the URL. This flaw enables a workspace Guest to supply asset UUIDs from different projects in the same workspace and reassign their issue_id, comment_id, page_id, draft_issue_id, or project_id to entities controlled by the attacker. Consequently, Plane treats the attacker's project as the owner and issues presigned download URLs for files the attacker should not access. The vulnerability is resolved in version 1.4.0.
Potential Impact
An attacker with Guest access to a workspace can bypass authorization controls to access and hijack assets from other projects within the same workspace. This results in unauthorized disclosure of sensitive files via presigned download URLs and unauthorized reassignment of asset ownership metadata. The vulnerability has a high confidentiality and integrity impact but does not affect availability.
Mitigation Recommendations
Upgrade Plane to version 1.4.0 or later, where this authorization bypass vulnerability is fixed. No other mitigations are specified or required once the official fix is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T16:40:39.611Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3ed982cdf04f6562b656a
Added to database: 10/05/2026, 18:34:00 UTC
Last enriched: 10/05/2026, 18:48:33 UTC
Last updated: 10/05/2026, 19:34:03 UTC
Views: 8
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