Vulnerability · Published Jun 12, 2026 · Assigned by GitHub_M

CVE-2026-42604Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`

Medium 6.9

In plain English

A medium-severity incorrect authorization in actual from actualbudget. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 65.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
actualbudget	actual	< 26.5.0

Weakness: CWE-863 · Vector: 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

References

https://github.com/actualbudget/actual/security/advisories/GHSA-49v6-pqjq-xw55 x_refsource_CONFIRM
https://actualbudget.org/blog/release-26.5.0 x_refsource_MISC