Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://actualbudget.org/blog/release-26.5.0
- https://github.com/actualbudget/actual/security/advisories/GHSA-49v6-pqjq-xw55
FAQ
What is CVE-2026-42604?
CVE-2026-42604 is a documented vulnerability. 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 `...
How severe is CVE-2026-42604?
CVSS scoring is not yet available for CVE-2026-42604. Check NVD for updates.
Is there a patch for CVE-2026-42604?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.