Vulnerability · Published Aug 27, 2026 · Assigned by VulnCheck
CVE-2026-80209Fonoster through 0.22.7 Incorrect Authorization in the Identity UpdateWorkspace Handler
Medium 4.3
In plain English
A medium-severity incorrect authorization in fonoster from fonoster. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
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.
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- GitHub Issue #861 issue-tracking
- https://github.com/fonoster/fonoster product
- https://github.com/fonoster/fonoster/blob/v0.22.7/mods/identity/src/workspaces/createUpdateWorkspace.ts#L47 technical-description
- VulnCheck Advisory: Fonoster through 0.22.7 Incorrect Authorization in the Identity UpdateWorkspace Handler third-party-advisory