CVE-2025-67634 is a cross-site scripting (XSS) vulnerability classified under CWE-79, found in the CISA Software Acquisition Guide Tool prior to version dated 2025-12-11. The vulnerability stems from improper neutralization of input during web page generation, specifically when users import JSON files containing text fields. An attacker can craft a malicious JSON file embedding JavaScript code that the tool fails to sanitize properly. When a user imports this file and proceeds by clicking the 'Next' button, the embedded JavaScript executes within the user's browser context. This execution can lead to unauthorized actions such as session hijacking, data theft, or manipulation of the tool's interface and data. The vulnerability requires local access to the tool and user interaction (importing the JSON and clicking 'Next') but does not require authentication or elevated privileges. The CVSS v4.0 score is 4.6, reflecting low attack vector (local), low complexity, no privileges required, but user interaction is necessary. There are no known exploits in the wild, and no patches have been linked yet. The vulnerability highlights a common web security issue where input fields are not properly sanitized before rendering, allowing script injection. This flaw is particularly critical in tools used for software acquisition guidance, as it could undermine trust and integrity in procurement processes.

For European organizations, the impact of this vulnerability includes potential compromise of sensitive procurement data and user credentials if exploited. Attackers could leverage the XSS flaw to perform session hijacking, steal authentication tokens, or manipulate the displayed information within the Software Acquisition Guide Tool. This could lead to unauthorized access to procurement workflows, exposure of supplier information, or insertion of malicious data affecting decision-making. Although the attack requires user interaction and local access, targeted phishing or social engineering campaigns could trick users into importing malicious JSON files. The confidentiality and integrity of procurement processes could be undermined, potentially affecting compliance with EU regulations on data protection and procurement transparency. Additionally, exploitation could damage organizational reputation and trust in government or enterprise software acquisition systems. Since the tool is used in critical acquisition workflows, disruption or manipulation could have downstream effects on software supply chain security.

To mitigate this vulnerability, organizations should implement strict controls on the sources of JSON files imported into the Software Acquisition Guide Tool, restricting imports to trusted and verified files only. Input validation and sanitization routines must be enhanced to neutralize any embedded scripts or malicious content within JSON text fields before rendering. Employ Content Security Policy (CSP) headers to limit the execution of inline scripts and reduce the impact of potential XSS attacks. Users should be trained to recognize suspicious files and avoid importing untrusted JSON data. Monitoring and logging import activities can help detect anomalous behavior. Until an official patch is released, consider isolating the tool in a secure environment with limited user access. Regularly check for updates from CISA and apply patches promptly once available. Additionally, organizations should review their procurement workflows to ensure that any data manipulation attempts can be detected and audited.