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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.

PUBLISHED Reserved 2026-04-29 | Published 2026-06-12 | Updated 2026-06-15 | Assigner GitHub_M




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

Problem types

CWE-863: Incorrect Authorization

Product status

< 26.5.0
affected

References

github.com/...actual/security/advisories/GHSA-49v6-pqjq-xw55

actualbudget.org/blog/release-26.5.0

cve.org (CVE-2026-42604)

nvd.nist.gov (CVE-2026-42604)

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