VU#166125: Bisheng has authentication bypass vulnerabilities
Overview Bisheng contains three vulnerabilities: a pre-authentication account takeover mechanism via a legacy single sign-on (SSO) endpoint; an Insecure Direct Object Reference (IDOR) vulnerability that exposes cross-user workflow data; and prior to version 2.5.0, authenticated attackers could perform cross-user LLM credential abuse and data disclosure due to missing service-layer access checks. Together, these flaws could allow unauthenticated attackers to gain administrative control while enabling authenticated users access to sensitive data and hardcoded credentials. Description Bisheng is an open-source Large Language Model (LLM) application DevOps platform, developed by DataElement, designed to assist in building, managing, and scaling LLMs. CVE-2026-96679 (Legacy SSO Bypass) A vulnerability resides in the legacy SSO endpoint (POST /user/sso). The application processes incoming JSON payloads containing arbitrary usernames and issues a valid JSON Web Token (JWT) without enforcing a
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