# CVE-2026-104975: Plane: Cross-tenant asset authorization bypass in Plane Spaces public-board endpoints

> Attackers can read, overwrite, or restore assets across projects and workspaces due to missing authorization checks in public-board endpoints.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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-jh4v-88j2-g65v

## What is CVE-2026-104975?

CVE-2026-104975 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, Plane's dashboard asset endpoints in plane/app/views/asset/v2.py were remediated for two cross-tenant asset IDORs, CVE-2026-27705 and CVE-2026-46558. Those fixes added a membership check and project_id and workspace__slug scoping to the asset endpoints in that file. The Spaces app in plane/space/views/asset.py serves related public-board operations under /api/public/ but was not remediated. Its EntityAssetEndpoint and AssetRestoreEndpoint resolve a DeployBoard from a public anchor and then read or modify FileAsset rows scoped only to the board's workspace, without a membership check or project_id constraint. An attacker can therefore read, overwrite, or restore assets across projects and workspaces. This issue is fixed in 1.4.0.

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

## Which versions are affected by CVE-2026-104975?


## How do I fix CVE-2026-104975?

No fix has been published for CVE-2026-104975 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104975 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104975 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104975 and fix it if it is affected.

What it is: CVE-2026-104975 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-2026-104975 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-2026-104975/ (Markdown: https://insights.sbomify.com/CVE-2026-104975/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104975
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104975
- OSV: https://osv.dev/vulnerability/CVE-2026-104975

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104975/
Summaries are generated and may contain mistakes; the official description above is the record.