# CVE-2026-104962: Plane: Cross-project member roster IDOR in ProjectMemberListCreateAPIEndpoint (missing project scope on reads)

> Authenticated users can read private project member rosters in other projects due to missing scope checks in the API endpoint.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-w2vf-m9x9-mvmc

## What is CVE-2026-104962?

CVE-2026-104962 is a medium-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, GET /api/v1/workspaces/{slug}/projects/{project_id}/members/ returns the complete project-member roster, including each member's email address, first and last name, display name, avatar, and role. ProjectMemberPermission gates the endpoint, but its SAFE_METHODS branch checks only whether the caller is an active ProjectMember of any project in the workspace and does not bind the check to view.project_id. The view then filters solely by the project_id supplied in the URL. Consequently, any authenticated user who belongs to one project in a workspace, including a Guest, can read the roster of another private project in the same workspace. This issue is fixed in 1.4.0.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-104962?


## How do I fix CVE-2026-104962?

No fix has been published for CVE-2026-104962 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104962 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104962 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104962 and fix it if it is affected.

What it is: CVE-2026-104962 is a medium-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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104962 exists.

Affected product: makeplane plane. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-104962/ (Markdown: https://insights.sbomify.com/CVE-2026-104962/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104962
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104962
- OSV: https://osv.dev/vulnerability/CVE-2026-104962

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104962/
Summaries are generated and may contain mistakes; the official description above is the record.