CVE-2026-27638CWE-862

ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode

Medium · published February 26, 2026

CVSS v4.0
5.7
EPSS
0%
Percentile
30.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.7 · MEDIUM
Vector
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
EPSS
0.00373 · 30.0th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-02-26T22:14Z
EPSS history
Timeline
  • 26 FEB 22:14Z
    ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
    cvelistv5