CVE-2026-102981: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in makeplane plane
Description
Plane, an open-source project management tool, prior to version 1.4.0, has a vulnerability where unauthenticated GET requests to a specific API endpoint expose secret invitation tokens. This allows an attacker to retrieve invitation tokens intended for other users and join workspaces without invitation, gaining assigned roles. The issue is fixed in version 1.4.0.
CVSS v3.1
Score 6.5medium
Affected software
makeplane
plane
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-102981 describes an information exposure vulnerability in Plane versions before 1.4.0. The vulnerability arises because the WorkspaceJoinEndpoint's WorkSpaceMemberInviteSerializer exposes secret invitation tokens via unauthenticated GET requests to api/workspaces/{slug}/invitations/{pk}/join/. An attacker can obtain tokens meant for other users and use them to join workspaces without receiving an invitation, thereby gaining the roles assigned to those invitations. This security flaw is addressed in Plane version 1.4.0.
Potential Impact
An external attacker can access secret invitation tokens without authentication and use them to join workspaces unauthorized, gaining roles assigned by the invitation. This leads to unauthorized access and potential privilege escalation within the affected Plane deployments.
Mitigation Recommendations
Upgrade Plane to version 1.4.0 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T20:46:08.333Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ace52f62cdf04f65680e4f2
Added to database: 10/13/2026, 15:49:10 UTC
Last enriched: 10/13/2026, 16:04:19 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 13
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