# CVE-2026-104971: Plane: Cross-Workspace Asset Duplication IDOR + WorkspaceFileAssetEndpoint and FileAssetEndpoint Missing Authorization

> Authenticated users can read, modify, or delete assets and views in workspaces they do not belong to due to missing authorization checks.

- **Severity:** High 8.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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-p57q-8hh8-7fc7

## What is CVE-2026-104971?

CVE-2026-104971 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, DuplicateAssetEndpoint fetches a source FileAsset without limiting it to the caller's workspace, allowing cross-workspace asset duplication. WorkspaceFileAssetEndpoint and the legacy FileAssetEndpoint omit workspace authorization, allowing authenticated users to read, create, modify, or delete assets in workspaces where they are not members. Separately, WorkspaceViewViewSet.retrieve lacks the authorization decorator used by its sibling actions, exposing an unauthorized workspace-view read surface. This issue is fixed in 1.4.0.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-104971?


## How do I fix CVE-2026-104971?

No fix has been published for CVE-2026-104971 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104971 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104971 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104971 and fix it if it is affected.

What it is: CVE-2026-104971 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104971 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-2026-104971/ (Markdown: https://insights.sbomify.com/CVE-2026-104971/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104971
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104971
- OSV: https://osv.dev/vulnerability/CVE-2026-104971

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104971/
Summaries are generated and may contain mistakes; the official description above is the record.