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    CVE-2026-27638

    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:Feb 26, 2026
    Last Modified:Apr 16, 2026
    EPS:Feb 26, 2026
    EPSS Score:0.00034
    CVSS Score:7.1

    Affected Products

    Vendor
    Actualbudget
    Product
    Actual

    Exploits

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

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-49229 (CVSS 8.3) — Actual is a local-first personal finance app. Prior to 26.6.0, in OpenID multi-user mode, disabling a user onl…
    CVE-2026-50179 (CVSS 4.2) — Actual is a local-first personal finance tool. Prior to 26.6.0, exportToCSV and exportQueryToCSV in packages/l…
    CVE-2026-46700 (CVSS 4.3) — Actual is a local-first personal finance tool. Prior to 26.6.0, the GET /secret/:name endpoint in @actual-app/…
    CVE-2026-46672 (CVSS 4.6) — Actual is a local-first personal finance app. Prior to 26.6.0, @actual-app/cli ships a hand-rolled CSV seriali…
    CVE-2026-50007 (CVSS 7.2) — Actual is an open-source personal finance application. Prior to 26.7.0, a missing authorization issue allows a…
    CVE-2026-43872 (CVSS 5.3) — Actual is an open-source personal finance application. Prior to version 26.5.0, several endpoints are affected…
    CVE-2026-42890 (CVSS 4.8) — Actual is an open-source personal finance application. In the macOS desktop application version 25.x (built on…
    CVE-2026-42604 (CVSS 6.9) — Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-serv…
    CVE-2026-33318 (CVSS 8.8) — Actual is a local-first personal finance tool. Prior to version 26.4.0, any authenticated user (including `BAS…
    CVE-2026-3089 (CVSS 5.3) — Actual Sync Server allows authenticated users to upload files through POST /sync/upload-user-file. In versions…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High