{"id":"CVE-2026-42604","aliases":["EUVD-2026-36543","GHSA-49v6-pqjq-xw55"],"status":"published","title":"Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`","description":"Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions \u003c= 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.","severity":{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.004,"percentile":0.34493,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2026-06-12T18:42:38Z","modified":"2026-10-28T02:30:50Z","products":[{"vendor":"actualbudget","product":"actual"}],"references":[{"url":"https://github.com/actualbudget/actual/security/advisories/GHSA-49v6-pqjq-xw55","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://actualbudget.org/blog/release-26.5.0","tags":["x_refsource_MISC","article"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42604.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42604","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-42604","title":"Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`","description":"Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions \u003c= 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.","status":"published","published":"2026-06-12T18:42:38.346Z","modified":"2026-06-15T13:10:30.083Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T13:40:23.731501Z"}],"euvd":[{"id":"EUVD-2026-36543","description":"Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions \u003c= 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.","status":"published","published":"2026-06-12T18:42:38Z","modified":"2026-06-15T13:10:30Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"updated_at":"2026-11-02T18:20:41.888684Z"}],"nvd":[{"id":"CVE-2026-42604","description":"Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions \u003c= 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.","status":"published","published":"2026-06-12T20:16:45.14Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"4.0","score":6.9,"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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:23.846948Z"}],"osv":[{"id":"CVE-2026-42604","title":"Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`","description":"Actual is a local-first personal finance tool. The `POST /openid/config` endpoint in Actual Budget's sync-server versions \u003c= 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.","status":"published","published":"2026-06-12T18:42:38.346Z","modified":"2026-10-28T02:30:50.151688663Z","cvss":[{"version":"4.0","score":6.9,"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","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:45:04.117819Z"}]}}