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

Quick assessment

Affected
actualbudget actual
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

actualbudget actual是actualbudget团队开源的一个个人财务管理应用。 actualbudget actual 26.5.0之前版本存在授权问题漏洞，该漏洞源于 端点暴露完整的OpenID Connect配置（包括OAuth2 client_secret），且该端点缺乏身份验证和速率限制，可能导致已知bootstrap密码的攻击者暴力破解密码。

AI Predicted 9.1 Difficulty: Easy EPSS 0.56% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
actualbudget actual < 26.5.0 affected
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I. Basic Information for CVE-2026-42604

Vulnerability Information
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Vulnerability Title
Actual has an OpenID `client_secret` Disclosure via Broken Authorization Guard in `/openid/config`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
actualbudget actual 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
actualbudget actual是actualbudget团队开源的一个个人财务管理应用。 actualbudget actual 26.5.0之前版本存在授权问题漏洞，该漏洞源于`POST /openid/config`端点暴露完整的OpenID Connect配置（包括OAuth2 client_secret），且该端点缺乏身份验证和速率限制，可能导致已知bootstrap密码的攻击者暴力破解密码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
actualbudget actual < 26.5.0 -

II. Public POCs for CVE-2026-42604

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III. Intelligence Information for CVE-2026-42604

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Vendor Advisories for CVE-2026-42604 (1)

Security Blog Posts for CVE-2026-42604 (1)

Same Patch Batch · actualbudget · 2026-06-12 · 3 CVEs total

CVE-2026-42890 actual Allows Electron to Run As Node
CVE-2026-43872 actual-server has a path traversal vulnerability

IV. Related Vulnerabilities

Same product: actual
Same vendor: actualbudget
Same weakness: CWE-863

V. Comments for CVE-2026-42604

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