# CVE-2026-104963: Missing authorization in plane

> Any authenticated workspace member can view private project metadata due to missing membership checks on cycle and module endpoints.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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:** 7 Oct 2026
- **Also known as:** GHSA-wcc5-qgfr-8g9c

## What is CVE-2026-104963?

CVE-2026-104963 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/workspaces/{slug}/cycles/ through WorkspaceCyclesEndpoint and GET /api/workspaces/{slug}/modules/ through WorkspaceModulesEndpoint return records from every project in a workspace without checking whether the requester belongs to each project. Any authenticated workspace member, including a Guest with access to only one project, can enumerate names, descriptions, sprint dates, issue counts, progress snapshots, external integration IDs, linked URLs, and member lists for cycles and modules in private projects. The sibling WorkspaceLabelsEndpoint and WorkspaceStatesEndpoint apply the correct project__project_projectmember__member=request.user filter, making the cycle and module endpoints inconsistent outliers. This issue is fixed in 1.4.0.

Weakness: CWE-863 (Incorrect Authorization), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-104963?


## How do I fix CVE-2026-104963?

No fix has been published for CVE-2026-104963 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104963 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104963 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104963 and fix it if it is affected.

What it is: CVE-2026-104963 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-2026-104963 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-2026-104963/ (Markdown: https://insights.sbomify.com/CVE-2026-104963/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104963
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104963
- OSV: https://osv.dev/vulnerability/CVE-2026-104963

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104963/
Summaries are generated and may contain mistakes; the official description above is the record.