CVE-2026-42604
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
Versions of Actual Budget's sync-server up to 26.4.0 expose the full OpenID Connect configuration, including the OAuth2 `client_secret`, to any caller who knows the bootstrap password. The endpoint lacks authentication and rate limiting, making it susceptible to brute-force attacks.
Risk Assessment
The exposure of the `client_secret` could lead to unauthorized access to resources and potential abuse within the system. Organizations should be aware of the risks associated with the security of users' financial data.
Recommendation
It is recommended to upgrade to version 26.5.0, which addresses this vulnerability. Additionally, implementing stronger authentication mechanisms and rate limiting is advisable.
Related vulnerabilities
- CVE-2026-109758Critical
Perforce Helix Authentication Service (HAS) versions 2022.1-2025.2 retain a default SCIM bearer token that is not automatically replaced with a random value during installation. An attacker knowing this token can gain unauthorized access to the SCIM API and perform user and group operations. This issue can be chained with CVE-2026-61834, potentially leading to remote code execution.
- CVE-2026-97229Critical
GitLab CE/EE versions from 19.2 to 19.2.8, 19.3 to 19.3.5, and 19.4 to 19.4.2 contain a vulnerability that, under certain conditions, could allow an unauthenticated user to execute arbitrary code on the GitLab server. The issue stems from insufficient validation of regular expressions in CI/CD configuration.
- CVE-2026-89111Critical
SAP Cloud SDK for Python contains an OAuth2 SSRF vulnerability affecting multi-tenant BTP applications. An attacker controlling the tenant_subdomain parameter can redirect OAuth2 token requests to an attacker-controlled server, leading to client credential exfiltration.
- CVE-2026-89110Critical
SAP NetWeaver Visual Composer does not perform sufficient authorization checks in certain portal functionality. An attacker with low privileges could invoke internal operations on a preconfigured remote system, which depending on the remote connection configuration could lead to full compromise of the remote system.
- CVE-2026-89108Critical
SAP Manufacturing Integration and Intelligence does not sufficiently enforce authorization boundaries within certain administrative functionality. An attacker with MII administrator privileges could submit a specially crafted request to provision an account with elevated privileges on the underlying Java application server. Successful exploitation could allow the attacker to gain administrative control over the system.
- CVE-2026-89107Critical
SAP S/4HANA (Manage Substitution/Validation Rules) does not sufficiently validate input processed by rule definition functionality that utilizes a domain-specific scripting language. An authenticated attacker with specific business privileges could submit specially crafted input, which is interpreted as executable ABAP code. Successful exploitation could allow the attacker to execute arbitrary ABAP code in the system.
- CVE-2026-87689Critical
Metasploit Framework Web Service REST API (msf-ws) exposes the credential store through Msf::WebServices::CredentialServlet. The update (PUT) and delete (DELETE) handlers for /api/v1/credentials omit the authentication call, unlike other routes. Any client able to reach the web service on its default 0.0.0.0:8080 listener can read, modify, or permanently delete every stored credential without authentication. All published versions through 6.5.4 are affected; fixed in 6.5.5 by adding authentication.
- CVE-2026-96119Critical
IBM i versions 7.3, 7.4, 7.5, and 7.6 could allow a remote authenticated attacker to obtain sensitive information or execute arbitrary code on the system due to improper data sanitization by the HTTP Server Administration web application.
- CVE-2026-82110Critical
IBM DataStage on Cloud Pak for Data 5.4.0.0 contains a path traversal vulnerability due to improper validation of pathnames. A remote authenticated attacker can exploit this to execute arbitrary code.
- CVE-2026-82103Critical
IBM DataStage on Cloud Pak for Data 5.4.0.0 exposes sensitive information to an unauthorized actor. A remote authenticated attacker can exploit this to obtain confidential data.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

