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OpenAdvisories
Medium · 5.7 CVE-2026-27638 EUVD-2026-8905GHSA-qmjj-p7m9-wjrv

ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode

Published Feb 26, 2026 · Updated Mar 2, 2026 · Assigned by GitHub_M

Description

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

VendorProductAffectedFixed
actualbudget actual < 26.2.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @actual-app/sync-server < 26.2.1 26.2.1 GHSA-qmjj-p7m9-wjrv

References