CVE-2026-33318

The record

Actual is a local-first personal finance tool. Prior to version 26.4.0, any authenticated user (including `BASIC` role) can escalate to `ADMIN` on servers migrated from password authentication to OpenID Connect. Three weaknesses combine: `POST /account/change-password` has no authorization check, allowing any session to overwrite the password hash; the inactive password `auth` row is never removed on migration; and the login endpoint accepts a client-supplied `loginMethod` that bypasses the server's active auth configuration. Together these allow an attacker to set a known password and authenticate as the anonymous admin account created during the multiuser migration. The three weaknesses form a single, sequential exploit chain — none produces privilege escalation on its own. Missing authorization on POST /change-password allows overwriting a password hash, but only matters if there is an orphaned row to target. Orphaned password row persisting after migration provides the target row, but is harmless without the ability to authenticate using it. Client-controlled loginMethod: "password" allows forcing password-based auth, but is useless without a known hash established by step 1. All three must be chained in sequence to achieve the impact. No single weakness independently results in privilege escalation. The single root cause is the missing authorization check on /change-password; the other two are preconditions that make it exploitable. Version 26.4.0 contains a fix.

Affected packages

Related vulnerabilities

• GHSA-prp4-2f49-fcgp Actual has Privilege Escalation via 'change-password' Endpoint on OpenID-Migrated Servers Same vulnerability
• GHSA-27vg-33gh-4hwg Actual Sync Server has an Authenticated Path Traversal Also affects @actual-app/sync-server
• CVE-2026-3089 Actual Sync Server allows authenticated users to upload files through POST… Also affects @actual-app/sync-server
• GHSA-qmjj-p7m9-wjrv @actual-app/sync-server: Missing authorization in sync endpoints allows cross-user budget… Also affects @actual-app/sync-server
• CVE-2026-27638 Actual is a local-first personal finance tool. Also affects @actual-app/sync-server
• GHSA-m2cq-xjgm-f668 ActualBudget server is Missing Authentication for SimpleFIN and Pluggy AI bank sync… Also affects @actual-app/sync-server
• CVE-2026-27584 Actual is a local-first personal finance tool. Also affects @actual-app/sync-server
• CVE-2026-114574 A security vulnerability has been detected in massCodeIO massCode 5.10. CWE-284