Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Actualbudget | Actual | < 26.2.1 |
Related Weaknesses (CWE)
References
- https://github.com/actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efPatch
- https://github.com/actualbudget/actual/releases/tag/v26.2.1ProductRelease Notes
- https://github.com/actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrvExploitVendor Advisory
FAQ
What is CVE-2026-27638?
CVE-2026-27638 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 t...
How severe is CVE-2026-27638?
CVE-2026-27638 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27638?
Check the references section above for vendor advisories and patch information. Affected products include: Actualbudget Actual.