identrail: Cross-tenant GitHub installation binding without ownership verification

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identrail is a machine identity security platform for AWS, GitHub/OIDC, and Kubernetes. Prior to 1.0.2, the default-on `POST /v1/workspaces/:workspace_id/projects/:project_id/github/connect/complete` endpoint in `internal/api/router.go` accepts `installation_id` from the request body or `X-GitHub-Installation-ID` header without verifying the installation belongs to the caller's workspace. `CompleteGitHubConnection` in `internal/api/github_connect.go` rigorously binds `state` to the caller's tenant, workspace, and project, but checks only that the installation ID is positive before persisting it as the caller's connection. `ListInstallationRepositories` in `internal/connectors/github/repositories.go` invokes token creation through `internal/connectors/github/app.go` and `POST /app/installations/{installationId}/access_tokens`, using the application's JWT. An authenticated tenant who starts a legitimate connection can supply another customer's non-secret installation ID to read the victim organization's private repository inventory, content, and metadata or drive posture scans, provided identrail's GitHub App is installed there. The default-off V2 `CompleteGitHubConnector` path shares the installation-ownership gap and additionally matches pending `state` without rechecking caller scope. This issue is fixed in version 1.0.2.

Source published

28 Oct 2026 13:15:53 UTC

Source modified

28 Oct 2026 16:07:10 UTC

Observed here

28 Oct 2026 17:46:48 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

identrail is a machine identity security platform for AWS, GitHub/OIDC, and Kubernetes. Prior to 1.0.2, the default-on `POST /v1/workspaces/:workspace_id/projects/:project_id/github/connect/complete` endpoint in `internal/api/router.go` accepts `installation_id` from the request body or `X-GitHub-Installation-ID` header without verifying the installation belongs to the caller's workspace. `CompleteGitHubConnection` in `internal/api/github_connect.go` rigorously binds `state` to the caller's tenant, workspace, and project, but checks only that the installation ID is positive before persisting it as the caller's connection. `ListInstallationRepositories` in `internal/connectors/github/repositories.go` invokes token creation through `internal/connectors/github/app.go` and `POST /app/installations/{installationId}/access_tokens`, using the application's JWT. An authenticated tenant who starts a legitimate connection can supply another customer's non-secret installation ID to read the victim organization's private repository inventory, content, and metadata or drive posture scans, provided identrail's GitHub App is installed there. The default-off V2 `CompleteGitHubConnector` path shares the installation-ownership gap and additionally matches pending `state` without rechecking caller scope. This issue is fixed in version 1.0.2.

Source published

Oct 28, 2026, 1:15:53 PM (timezone not stated)

Source modified

Oct 28, 2026, 4:07:10 PM (timezone not stated)

Observed here

30 Oct 2026 10:50:57 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

identrail is a machine identity security platform for AWS, GitHub/OIDC, and Kubernetes. Prior to 1.0.2, the default-on `POST /v1/workspaces/:workspace_id/projects/:project_id/github/connect/complete` endpoint in `internal/api/router.go` accepts `installation_id` from the request body or `X-GitHub-Installation-ID` header without verifying the installation belongs to the caller's workspace. `CompleteGitHubConnection` in `internal/api/github_connect.go` rigorously binds `state` to the caller's tenant, workspace, and project, but checks only that the installation ID is positive before persisting it as the caller's connection. `ListInstallationRepositories` in `internal/connectors/github/repositories.go` invokes token creation through `internal/connectors/github/app.go` and `POST /app/installations/{installationId}/access_tokens`, using the application's JWT. An authenticated tenant who starts a legitimate connection can supply another customer's non-secret installation ID to read the victim organization's private repository inventory, content, and metadata or drive posture scans, provided identrail's GitHub App is installed there. The default-off V2 `CompleteGitHubConnector` path shares the installation-ownership gap and additionally matches pending `state` without rechecking caller scope. This issue is fixed in version 1.0.2.

Source published

28 Oct 2026 14:17:05 UTC

Source modified

28 Oct 2026 16:17:08 UTC

Observed here

29 Oct 2026 16:15:34 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 8.5 CVSS:3.1/AV: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.

Source published

9 Sep 2026 23:52:14 UTC

Source modified

17 Sep 2026 17:40:57 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Publisher rating · HIGH

Identrail Cross-tenant IDOR: Client-supplied GitHub App installation_id is bound to the caller's workspace without ownership verification in github.com/identrail/identrail

Source published

16 Sep 2026 16:56:22 UTC

Source modified

17 Sep 2026 17:30:11 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.