Plane: Broken access control in joinProject lets members join private projects
Summary
Plane is an open-source project management tool. In versions before 1.4.0, the GraphQL joinProject mutation lets any workspace member add themselves to any project in the same workspace, including private (secret) projects, with full Member rights. The resolver checks only workspace membership and role, not the visibility of the target project. An attacker with a low-privilege account can therefore read and modify confidential data in private projects.
Affected
- Plane (makeplane/plane) versions before 1.4.0
Fixed in
- Fixed in version 1.4.0
Workaround
Unknown.
- No workaround is documented in the sources. Limit workspace invitations to trusted users until the update is installed.
Exploitation
- CISA SSVC: exploitation 'poc', automatable: no, technical impact: total.
- No public exploit is confirmed in the sources, and the CVE is not listed in CISA KEV.
- Exploitation in the wild: unknown.
Our recommendation
- Upgrade Plane to version 1.4.0 or a later 1.4.x release and check its changelog.
- Review the members of private projects for unexpected accounts.
- Restrict workspace invitations to trusted users and monitor project membership changes.
- Check whether the instance is reachable from the internet, as this increases the risk.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-45hc-q4mw-jhxm github.com
- Plane v1.4.0 release github.com
- Fix commit e1ef420 github.com
- Pull request #9333 github.com
- OSV entry CVE-2026-105632 osv.dev
- Strix CVE-2026-105632 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 05:34.
Original description (NVD)
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.
NVD references (5)
- https://github.com/makeplane/plane/commit/e1ef42023ab66b5e722a8750e1bc5ba0d413a3ee
- https://github.com/makeplane/plane/pull/9333
- https://github.com/makeplane/plane/releases/tag/v1.4.0
- https://github.com/makeplane/plane/security/advisories/GHSA-45hc-q4mw-jhxm
- https://github.com/makeplane/plane/security/advisories/GHSA-45hc-q4mw-jhxm
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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