CVE-2026-42604

EUVD-2026-36543
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
6.9 MEDIUM
NETWORK
LOW
NONE
CVSS: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
Base Score
CVSS 3.x
EPSS Score
Percentile: 10%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
actualbudgetactual
𝑥
< 26.5.0
CNA
Common Weakness Enumeration
References
https://actualbudget.org/blog/release-26.5.0
https://github.com/actualbudget/actual/security/advisories/GHSA-49v6-pqjq-xw55