CVE-2025-53003: 
Java vulnerability analysis and mitigation

The Janssen Project's Config API vulnerability (CVE-2025-53003) was discovered and disclosed on June 30, 2025. This critical security flaw affects the open-source identity and access management (IAM) platform's Config API in versions prior to 1.8.0. The vulnerability allows the API to return results without proper scope verification, affecting both Janssen (<1.8.0) and Gluu Flex (<5.8.0) users (GitHub Advisory).

The vulnerability stems from the Config API's failure to properly verify scope permissions before returning results. This security flaw has been assigned a CVSS v4.0 score of 8.2 (HIGH) with the vector string CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. The issue is classified under multiple CWE categories including CWE-200 (Exposure of Sensitive Information), CWE-269 (Improper Privilege Management), and CWE-284 (Improper Access Control) (NVD).

Despite being an internal service that should not be exposed to the internet, this vulnerability presents a significant security risk with a large internal surface attack area. It potentially exposes sensitive information from the Identity Provider (IDP) including clients, users, and scripts. The vulnerability affects the confidentiality of the system by allowing unauthorized access to sensitive data (GitHub Security Advisory).

The vulnerability has been patched in Janssen version 1.8.0 and Gluu Flex version 5.8.0. Users are strongly advised to upgrade immediately to these versions. For those unable to upgrade immediately, a temporary workaround involves forking and building the config API, then applying the patch following commit 92eea4d (GitHub Release).