CVE-2026-27638 | THREATINT

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.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

MEDIUM: 5.7CVSS: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

Problem types

CWE-862: Missing Authorization

Product status

< 26.2.1

affected

References

github.com/...actual/security/advisories/GHSA-qmjj-p7m9-wjrv

github.com/...ommit/9966c024cb75f57943193cac8e42f401efed9d08

github.com/actualbudget/actual/releases/tag/v26.2.1

cve.org (CVE-2026-27638)

nvd.nist.gov (CVE-2026-27638)

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