Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-55429
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 01:22 UTC · Revision 1
Source evidence
Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID
core-osv · Original sourcePublished 8 Jul 2026, 00:00 UTC
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.
osv:CVE-2026-55429
Complete source record
{
"id": "e1f60b4fe010981840fea0ae837d37ac09dfe323fb2453be8ebe921d39b13695",
"url": "https://osv.dev/vulnerability/CVE-2026-55429",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID",
"summary": "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.",
"evidence": "osv:CVE-2026-55429",
"products": [],
"severity": "high",
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"aliases": [
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"GHSA-9rjw-3gwp-f59v",
"GO-2026-5909"
],
"metrics": [
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"type": "CVSS_V3",
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"modified": "2026-10-28T02:30:32.375005351Z",
"provider": "osv",
"references": [
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"https://github.com/coder/coder/releases/tag/v2.33.8",
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"https://github.com/coder/coder/pull/26103"
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"source_id": "core-osv",
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"published_at": "2026-07-08T00:00:33.785+00:00"
}