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**Name of the Vulnerable Software and Affected Versions** cnvs.io Canvas version 3.3.0 **Description** The issue concerns a cross-site scripting (XSS) problem. It affects the title and content fields when creating a new post, as well as during the creation of new tags and users. **Recommendations** For cnvs.io Canvas version 3.3.0, consider restricting access to the "Posts > Add New" action and the creation of new tags and users until a fix is available. As a temporary workaround, avoid using the title and content fields in the "Posts > Add New" action, and limit the creation of new tags and users to minimize the risk of exploitation.