CVE-2026-55429 | 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.

Published: 2026-07-07 Last update: 2026-07-08 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-55429 is rated Moderate Risk (48.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.52%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-55429

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-08 — 0.52% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-55429

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.3 5.8 [email protected]

Weakness enumeration for CVE-2026-55429

GitHub Security Advisory for CVE-2026-55429

GHSA-9rjw-3gwp-f59v · Severity: high · Ecosystem: go — Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID

Affected software / configurations for CVE-2026-55429

Vendor Product Version Raw CPE
coder coder < 2.29.17 cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*
coder coder >= 2.30.0, < 2.32.7 cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*
coder coder >= 2.33.0, < 2.33.8 cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*
coder coder >= 2.34.0, < 2.34.2 cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*

References for CVE-2026-55429

cvelogic Threat Intelligence