CVE-2026-42604: Actualbudget Actual

Medium severity, CVSS 6.9. EPSS: 0.6% chance of exploitation in the next 30 days.

Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions <= 26.4.0 exposes the full OpenID Connect configuration—including the OAuth2 `client_secret`—to any caller who knows the bootstrap password. The endpoint also lacks authentication and rate limiting, making the bootstrap password brute-forceable. Version 26.5.0 fixes the issue.

Affected products

• Actualbudget Actual: before 26.5.0 (fixed in 26.5.0)

Published 2026-06-12. Last modified 2026-06-17.