CVE-2026-104969: 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, the cycle-issues endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can add issues from any workspace to a cycle they control. If a victim issue is already assigned to a cycle, the operation removes it from the victim's cycle, causing a destructive cross-tenant write. This issue is fixed in 1.4.0.
CVSS v3.1
Score 6.5medium
Affected software
makeplane
plane
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-104969 describes an authorization bypass vulnerability (CWE-639) in the Plane project management tool before version 1.4.0. The vulnerability exists because the cycle-issues endpoint accepts issue UUIDs without verifying workspace ownership. An authenticated user can manipulate cycles by adding issues from other workspaces, which can remove those issues from their original cycles, resulting in unauthorized destructive cross-tenant modifications. This flaw is resolved in Plane version 1.4.0.
Potential Impact
An authenticated user can add issues from any workspace to a cycle they control without proper authorization checks. This can lead to destructive cross-tenant writes by removing issues from their original cycles, impacting data integrity across different workspaces. There is no confidentiality or availability impact reported. The CVSS v3.1 base score is 6.5 (medium severity), reflecting high integrity impact but no confidentiality or availability impact.
Mitigation Recommendations
Upgrade Plane to version 1.4.0 or later, where this authorization bypass vulnerability is fixed. No other mitigation or workaround is indicated. Since this is not a cloud service, remediation depends on applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-02T18:16:13.629Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3d88b2cdf04f656204398
Added to database: 10/05/2026, 17:04:11 UTC
Last enriched: 10/05/2026, 17:19:09 UTC
Last updated: 10/05/2026, 18:56:34 UTC
Views: 12
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