CVE-2026-27638
ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
- State
- Published
- Severity
- 5.7 Medium
- Published
- Feb 26, 2026
- Updated
- Mar 2, 2026
- Reserved
- Feb 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.7 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P | GitHub_M |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
actualactualbudget |
|
References
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