fkie_cve-2026-46672

Actual is a local-first personal finance app. Prior to 26.6.0, @actual-app/cli ships a hand-rolled CSV serializer in packages/cli/src/output.ts used whenever the global --format csv option is passed, whose escapeCsv helper only handles RFC 4180 delimiter, quote, and newline escaping and does not neutralize standard CSV formula-injection prefixes. Any CLI command that streams an object array containing user-controlled strings, including transactions list, accounts list, payees list, categories list, tags list, category-groups list, rules list, schedules list, and query, can emit cells that auto-evaluate when the resulting CSV is opened in Excel, LibreOffice Calc, or Google Sheets, enabling data exfiltration and arbitrary formula execution. This issue is fixed in version 26.6.0.

GHSA-7gh7-258j-4mpq — @actual-app/cli `--format csv` Output Vulnerable to CSV Formula Injection via Custom `escapeCsv` Helper

Affected: npm: @actual-app/cli

## Summary

`@actual-app/cli` ships a hand-rolled CSV serializer in `packages/cli/src/output.ts` (used whenever the global `--format csv` option is passed) whose `escapeCsv` helper only handles RFC 4180 delimiter/quote/newline escaping. It does **not** neutralize the standard CSV formula-injection prefixes (`=`, `+`, `-`, `@`, `\t`, `\r`). Any CLI command that streams an object array containing user-controlled strings — `transactions list`, `accounts list`, `payees list`, `categories list`, `tags list`, `category-groups list`, `rules list`, `schedules list`, `query` — will emit cells that auto-evaluate when the resulting CSV is opened in Excel, LibreOffice Calc, or Google Sheets, enabling data exfiltration (`=HYPERLINK(...)`, `=WEBSERVICE(...)`) and arbitrary formula execution.

This is a **distinct variant** of the formula-injection surface in `packages/loot-core/src/server/transactions/export/export-to-csv.ts` (which uses `csv-stringify` and would need a separate `cast` option fix) — they are different files, different packages, and different serializers. Fixing one does not fix the other.

## Details

### Vulnerable code

`packages/cli/src/output.ts:98-103`:

```ts function escapeCsv(value: string): string { if (value.includes(',') || value.includes('"') || value.includes('\n')) { return '"' + value.replace(/"/g, '""') + '"'; } return value; } ```

The helper performs only delimiter/quote/newline neutralization, which is sufficient for RFC 4180 *parsing* but irr…

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fkie_cve-2026-46672

GHSA-7gh7-258j-4mpq — @actual-app/cli `--format csv` Output Vulnerable to CSV Formula Injection via Custom `escapeCsv` Helper