CVE-2026-42604CWE-863

Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`

Medium · published June 12, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
46.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.00564 · 46.1th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-06-12T18:42Z
EPSS history
Timeline
  • 12 JUN 18:42Z
    Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`
    cvelistv5