Executive Summary

This vulnerability in Next.js Image Optimization allows attacker-controlled external image sources to trigger file downloads with arbitrary content and filenames under specific configurations. Essentially, an attacker can inject content by making the application download files that the attacker controls, which can be used for malicious purposes such as phishing or delivering harmful files.

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Impact Analysis

The vulnerability can be abused to deliver malicious files or conduct phishing attacks by tricking users into downloading harmful content with attacker-controlled filenames. This can lead to security risks such as malware infection or social engineering attacks.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Next.js to version 14.2.31 or later if you are on the 14.x branch, or to version 15.4.5 or later if you are on the 15.x branch. Avoid using vulnerable versions before these fixed releases to prevent exploitation of the content injection issue.

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