# CVE-2026-80209: Fonoster through 0.22.7 Incorrect Authorization in the Identity UpdateWorkspace Handler

> Any authenticated user can rename arbitrary workspaces due to a logic error where authorization checks fail to halt execution before database updates.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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:** 27 Aug 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-xqrc-3jm3-hm6q

## What is CVE-2026-80209?

CVE-2026-80209 is a medium-severity missing authorization vulnerability in fonoster, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The updateWorkspace handler in mods/identity/src/workspaces/createUpdateWorkspace.ts in Fonoster through 0.22.7 invokes the gRPC callback with PERMISSION_DENIED when createIsWorkspaceMember reports that the caller is not a member of the target workspace, but it does not return. Execution continues into prisma.workspace.update, which is scoped by the workspace reference alone, so the rename commits before the second callback is issued and the caller receives a permission error for a write that already succeeded. The gRPC interceptor in mods/common/src/identity/createAuthInterceptor.ts binds the workspace accessKeyId to the caller's token only for paths in workspaceResourceAccess or workspaceResourceOwnerOrAdminAccess, and Identity/UpdateWorkspace is listed in fullIdentityAccess, which the base USER role holds. Any authenticated user can therefore rename an arbitrary workspace in the deployment.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-80209?


## How do I fix CVE-2026-80209?

No fix has been published for CVE-2026-80209 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-80209 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-80209 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-80209 and fix it if it is affected.

What it is: CVE-2026-80209 is a medium-severity missing authorization vulnerability in fonoster, published on 27 Aug 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-2026-80209 exists.

Affected product: fonoster. 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-2026-80209/ (Markdown: https://insights.sbomify.com/CVE-2026-80209/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-80209
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-80209
- OSV: https://osv.dev/vulnerability/CVE-2026-80209

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-80209/
Summaries are generated and may contain mistakes; the official description above is the record.