GHSA-c7v7-rqfm-f44j: 
Java vulnerability analysis and mitigation

The vulnerability (GHSA-c7v7-rqfm-f44j/CVE-2025-9467) affects Vaadin Platform's file upload validation functionality. Discovered and disclosed on September 4, 2025, this moderate severity vulnerability (CVSS score 5.3) impacts multiple versions of Vaadin Platform including versions 14.0.0-14.13.0, 23.0.0-23.6.1, and 24.0.0-24.7.6. The vulnerability specifically affects the Upload component's start listener functionality when used for validating metadata about incoming uploads (Vaadin Advisory, GitHub Advisory).

The vulnerability is classified as CWE-20 (Improper Input Validation) and CWE-434 (Unrestricted Upload of File with Dangerous Type). The CVSS v4.0 metrics indicate a network attack vector with low attack complexity, requiring low privileges and no user interaction. The vulnerability has low impact on both integrity and availability, with no impact on confidentiality. The vulnerability specifically manifests when the Upload component's start listener is used for metadata validation, allowing potential bypass of the upload validation mechanisms (GitHub Advisory, Vaadin Advisory).

The vulnerability allows attackers to bypass file upload validation on the server-side when using Vaadin Upload's start listener. This could potentially lead to unauthorized file uploads, bypassing intended security controls. The CVSS metrics indicate low impact on both system integrity and availability, though no direct impact on confidentiality has been identified (Vaadin Advisory).

Users are advised to upgrade to patched versions: 14.13.1 for version 14.x, 23.6.2 for version 23.x, or 24.7.7 for version 24.x. For users of older versions, specific upgrade paths are provided: version 7.x should upgrade to 7.7.48, and version 8.x should upgrade to 8.28.2. It's noted that Vaadin versions 10-13 and 15-22 are no longer supported, and users should update to either the latest 14, 23, or 24 version (Vaadin Advisory).