# CVE-2026-105634: Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles

> A guest user can demote administrators and members, effectively taking control of the project by bypassing role restrictions.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`)
- **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:** 6 Oct 2026
- **Also known as:** GHSA-494h-3rcq-5g3c

## What is CVE-2026-105634?

CVE-2026-105634 is a high-severity 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 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-105634?


## How do I fix CVE-2026-105634?

No fix has been published for CVE-2026-105634 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-105634 being exploited?

There is no known exploitation of CVE-2026-105634 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105634 and fix it if it is affected.

What it is: CVE-2026-105634 is a high-severity 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: There is no known exploitation of CVE-2026-105634 in the wild and no public exploit code.

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-2026-105634/ (Markdown: https://insights.sbomify.com/CVE-2026-105634/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105634
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105634
- OSV: https://osv.dev/vulnerability/CVE-2026-105634

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105634/
Summaries are generated and may contain mistakes; the official description above is the record.