Missing Authorization Affecting @actual-app/sync-server package, versions <26.2.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published1 Mar 2026
- disclosed27 Feb 2026
- creditq1uf3ng
Introduced: 27 Feb 2026
CVE-2026-27638 (opens in a new tab)How to fix?
Upgrade @actual-app/sync-server to version 26.2.1 or higher.
Overview
@actual-app/sync-server is an actual syncing server
Affected versions of this package are vulnerable to Missing Authorization via the /sync/* endpoints due to missing verification that the authenticated user owns or has access to the targeted file. An attacker can access, modify, or overwrite other users' budget files by supplying their file ID.
Note: This is only exploitable if the application is running in multi-user mode (OpenID).