PT-2026-55584 · Go · Github.Com/Identrail/Identrail

CVE-2026-59185

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Published

2026-07-03

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Updated

2026-09-09

CVSS v3.1

8.5

High

VectorAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

identrail's GitHub App connection-completion endpoint binds a fully client-supplied installation id to the caller's workspace without verifying that the installation belongs to, or was installed by, the workspace that initiated the connect flow. identrail then mints a GitHub App installation access token for the supplied installation id using the app's own JWT, so an authenticated tenant can link any other identrail customer's GitHub App installation into their own workspace and read that victim organization's private repositories.

Affected code (default-on path, no feature flag)

  • Route: internal/api/router.go:3590 — POST /v1/workspaces/:workspace id/projects/:project id/github/connect/complete. installation id is read from the JSON body or the attacker-controlled X-GitHub-Installation-ID header (router.go:3582-3588).
  • Service: internal/api/github connect.go:781 CompleteGitHubConnection. The state token IS rigorously bound to the caller's scope (github connect.go:818: if stateRecord.TenantID != scope.TenantID || stateRecord.WorkspaceID != project.WorkspaceID || stateRecord.ProjectID != project.ProjectID { ... }), but the only check on installation id is request.InstallationID <= 0 (:794). The raw client value is persisted as the workspace's connection (:840).
  • Cross-tenant read primitive: internal/connectors/github/repositories.go:39 ListInstallationRepositories → internal/connectors/github/app.go:170 mints a token via POST /app/installations/{installationId}/access tokens signed with the App JWT, succeeding for any installation where identrail's app is installed.
The feature-flagged V2 path CompleteGitHubConnector (github connect.go:447, default off) shares the gap and is additionally weaker (matches pending connector by state value alone with no caller-scope re-check); a single fix should cover both.

Intent proof

The code binds state to {TenantID, WorkspaceID, ProjectID} and re-verifies it at completion (:818), demonstrating it understands binding is required. The asymmetry — state bound, installation id unbound — is the missed check.

Exploitation

  1. Attacker is any authenticated identrail tenant; they call StartGitHubConnection for their own workspace and receive a state.
  2. Attacker calls the completion route with {state: <their state>, installation id: V} where V is a victim org's identrail GitHub App installation id (installation ids are not secret — they appear in post-install redirect URLs, webhook payloads, the org's GitHub App settings, and are enumerable integers).
  3. CompleteGitHubConnection accepts (state matches attacker scope), ListInstallationRepositories(V) mints a token for V and lists the victim org's private repos, and the connection is persisted under the attacker's workspace.
  4. Attacker now reads the victim org's private repository inventory and can drive posture scans/repo reads via their own workspace.
Impact: cross-tenant disclosure of another customer organization's private GitHub repositories and metadata.

Remediation

Bind installation id with the same rigor as state: capture it from GitHub's signed post-install redirect (setup url/callback url) and pin it to the pending state at start time, and/or after minting verify the installation's account matches the org the initiating workspace is authorized for.

Fix

Missing Authorization

IDOR

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Weakness Enumeration

CWE-862CWE-639

Related Identifiers

CVE-2026-59185
GHSA-CP3J-M783-3PH5

Affected Products

Github.Com/Identrail/Identrail