CVE-2026-105634
Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Plane is an open-source project management tool. Prior to 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.
| CWE | CWE-269 |
| Vendor | makeplane |
| Product | plane |
| Published | Oct 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
makeplane / plane
< 1.3.0
References
github.com: https://github.com/makeplane/plane/security/advisories/GHSA-494h-3rcq-5g3c github.com: https://github.com/makeplane/plane/pull/8833 github.com: https://github.com/makeplane/plane/commit/587fe76032fb69275866fdeb655699a70a83c521 github.com: https://github.com/makeplane/plane/releases/tag/v1.3.0