Executive Summary

This vulnerability exists in ApostropheCMS version 4.29.0, an open-source Node.js content management system. It is a stored cross-site scripting (XSS) vulnerability found in the image widget functionality.

A user with the Editor role can configure an image widget link to use a malicious javascript: URL payload. Since editors have permission to publish pages, this malicious widget can be published to the live site.

When another user, including administrators or public visitors, clicks the affected image or link, arbitrary JavaScript code executes in their browser, potentially leading to unauthorized actions or data exposure.

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Impact Analysis

This vulnerability can lead to arbitrary JavaScript execution in the browsers of users who click on the malicious image or link.

Potential impacts include theft of sensitive information such as cookies or session tokens, unauthorized actions performed on behalf of the victim, and compromise of user accounts.

Because the malicious code runs in the context of the affected site, it can affect administrators, editors, and public visitors, increasing the risk and scope of the attack.

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Mitigation Strategies

As of the time of publication, no known patched versions of ApostropheCMS are available to fix this vulnerability.

To mitigate the risk, restrict or review the permissions of users with the Editor role to prevent them from configuring image widget links with javascript: URL payloads.

Additionally, consider disabling or limiting the use of image widgets that allow link configuration until a patch is released.

Educate users and administrators to be cautious when clicking on image links published by editors.

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