CVE-2026-27638: Actualbudget Actual

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Actual is a local-first personal finance tool. Prior to version 26.2.1, in multi-user mode (OpenID), the sync API endpoints (`/sync/*`) don't verify that the authenticated user owns or has access to the file being operated on. Any authenticated user can read, modify, and overwrite any other user's budget files by providing their file ID. Version 26.2.1 patches the issue.

Affected products

• Actualbudget Actual: before 26.2.1 (fixed in 26.2.1)

Published 2026-02-26. Last modified 2026-06-17.