# CVE-2026-102981: Plane: Unauthenticated Workspace Invitation Token Leakage

> Unauthenticated attackers can retrieve workspace invitation tokens to join projects and gain unauthorized access to self-hosted Plane instances.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-gf48-p6jp-cwc4

## What is CVE-2026-102981?

CVE-2026-102981 is a medium-severity vulnerability in makeplane plane, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Plane is an open-source project management tool. Prior to 1.4.0, self-hosted Plane deployments allow unauthenticated GET requests to api/workspaces/{slug}/invitations/{pk}/join/ through WorkspaceJoinEndpoint, whose WorkSpaceMemberInviteSerializer exposes the secret invitation token directly and through get_invite_link. An external attacker can retrieve a token intended for another user and submit it to the invitation acceptance flow, joining the workspace without receiving the invitation and gaining the role assigned to the invite. This issue is fixed in version 1.4.0.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-102981?


## How do I fix CVE-2026-102981?

No fix has been published for CVE-2026-102981 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-102981 being exploited?

There is no known exploitation of CVE-2026-102981 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102981 and fix it if it is affected.

What it is: CVE-2026-102981 is a medium-severity vulnerability in makeplane plane, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-102981 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-2026-102981/ (Markdown: https://insights.sbomify.com/CVE-2026-102981/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102981
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102981
- OSV: https://osv.dev/vulnerability/CVE-2026-102981

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-102981/
Summaries are generated and may contain mistakes; the official description above is the record.