CVE-2026-55429: Coder

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `UpsertWorkspaceApp` overwrites an existing app's `agent_id` on a primary-key conflict and `insertAgentApp` accepts the app ID from the provisioner's `CompleteJob` payload without verifying it belongs to the workspace being built. `CompleteJob` runs under `dbauthz.AsProvisionerd` so the authorization layer does not block the cross-workspace upsert. Exploitation requires elevated access as a template author or external provisioner operator. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 verifies that any existing `workspace_apps` row matching the supplied ID belongs to the workspace being built and rejects cross-workspace agent reassignment. No known workarounds are available.

Affected products

• Coder Coder: before 2.29.17 (fixed in 2.29.17); from 2.30.0, before 2.32.7 (fixed in 2.32.7); from 2.33.0, before 2.33.8 (fixed in 2.33.8); from 2.34.0, before 2.34.2 (fixed in 2.34.2)

Published 2026-07-08. Last modified 2026-07-08.