CVE-2026-27638
ActualBudget missing authorization in sync endpoints allows cross-user budget file access in multi-user mode
MEDIUM 5.7EPSS 0.4%
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.
- Affected
- actualbudget · actual
- CVSS v4.0 GITHUB
- 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 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 - CVSS v3.1 NVD
- 7.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - EPSS
- 0.37% chance of exploitation in the next 30 days, 30th percentile
- Published
- 2026-02-26
- Updated
- 2026-03-02
Proof-of-concept exploits (1)
Security advisories
- actualbudget/actual/security/advisories/GHSA-qmjj-p7m9-wjrv
- actualbudget/actual/commit/9966c024cb75f57943193cac8e42f401efed9d08