CVE-2026-105632 Plane: Broken Access Control - joinProject GraphQL mutation allows self-join into private (secret) projects
A workspace member can self-join private projects via GraphQL, gaining unauthorized read and write access to confidential data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105632?
CVE-2026-105632 is a high-severity missing authorization vulnerability in makeplane plane, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Plane is an open-source project management tool. Prior to 1.4.0, the GraphQL joinProject mutation lets any workspace member add themselves to any project in that workspace including network=0 (secret/private) projects they were never invited to and grants them a full Member role (read + write). The resolver checks only workspace-level membership/role and never checks the target project's visibility (network). This collapses project-level tenant isolation within a workspace: a low-privilege member can read and modify confidential data in every private project. This issue is fixed in 1.4.0.
Weakness: CWE-284
Which versions are affected by CVE-2026-105632?
How do I fix CVE-2026-105632?
No fix has been published for CVE-2026-105632 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-105632 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105632 exists.
Sources
Also known as GHSA-45hc-q4mw-jhxm.