Moderate severityNVD Advisory· Published Feb 26, 2026· Updated Mar 2, 2026
ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
CVE-2026-27638
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@actual-app/sync-servernpm | < 26.2.1 | 26.2.1 |
Affected products
2- Range: < 26.2.1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-qmjj-p7m9-wjrvghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-27638ghsaADVISORY
- github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08ghsax_refsource_MISCWEB
- github.com/actualbudget/actual/releases/tag/v26.2.1ghsax_refsource_MISCWEB
- github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrvghsax_refsource_CONFIRMWEB
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