CVE-2026-108676 in JeecgBoot
Summary
by MITRE • 10/11/2026
JeecgBoot through 3.9.5 contains a missing authorization vulnerability in the SysAnnouncementController downLoadFiles handler that allows low-privileged authenticated users to download announcement attachments. Attackers can supply a known announcement id to retrieve a ZIP of attachments from unreleased announcements or those addressed only to other users.
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Analysis
by VulDB Data Team • 10/11/2026
The identified security flaw resides within the JeecgBoot framework, specifically affecting versions up through 3.9.5, and centers on an improper access control mechanism in the SysAnnouncementController component. The vulnerability is located in the downLoadFiles handler method, which is designed to retrieve and package announcement attachments into a ZIP file for user download. In a properly secured system, this endpoint should enforce strict authorization checks to ensure that only users with explicit permission or those who are direct recipients of an announcement can access its associated files. However, the implementation fails to validate whether the authenticated user requesting the resource is actually authorized to view the specific announcement identified by the provided identifier. This absence of server-side role-based or object-level access control allows any authenticated user, regardless of their privilege level, to interact with this endpoint directly.
By exploiting this missing authorization logic, an attacker can manipulate the request parameters to supply a known or guessed announcement ID rather than relying on authorized navigation paths within the application interface. Since the system does not verify if the requesting session belongs to a recipient of that specific announcement, it proceeds to fetch and compress the attachments associated with that ID. This behavior effectively bypasses intended privacy controls, allowing low-privileged authenticated users to retrieve sensitive documents from announcements that have not yet been publicly released or are targeted exclusively at other user groups such as administrators or senior management. The ability to access unreleased content poses a significant risk of information leakage, potentially exposing strategic plans, internal communications, or confidential data before it is intended for general distribution.
The operational impact of this vulnerability extends beyond simple data exposure; it undermines the integrity of the announcement system and erodes trust in the application's security model. Attackers can systematically enumerate valid announcement IDs to harvest a wide range of attachments, leading to a comprehensive breach of confidentiality. This type of flaw is categorized under CWE-284, which describes Improper Access Control, as the software does not properly restrict access for unauthorized actors. Furthermore, from an offensive perspective, this vulnerability aligns with MITRE ATT&CK technique T1078, Valid Accounts, where attackers leverage existing credentials to move laterally or extract data without needing elevated privileges initially. The ease of exploitation means that even users with minimal permissions can become vectors for significant data exfiltration if they are aware of valid announcement identifiers.
To mitigate this vulnerability, developers must implement robust server-side authorization checks within the downLoadFiles handler before processing any download requests. This involves verifying that the currently authenticated user is explicitly listed as a recipient or has administrative rights to view the specific announcement ID being requested. Additionally, implementing indirect reference maps can help obscure direct IDs from client-side manipulation, although this should not replace strict access control validation. Upgrading to a patched version of JeecgBoot where these authorization checks have been corrected is the primary remediation strategy. In the interim, if an upgrade is not immediately feasible, deploying a Web Application Firewall rule that monitors for anomalous download patterns or restricting direct API access based on user roles can provide temporary protection against exploitation until the codebase is updated to enforce proper object-level permissions.