Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in Open WebUI's Notes PDF download feature before version 0.6.37. An attacker can import a Markdown file containing malicious SVG tags into the Notes section. When a victim downloads the note as a PDF, the embedded JavaScript executes, allowing the attacker to steal session tokens. Both authenticated and unauthenticated attackers can exploit this by sharing specially crafted markdown files.

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Impact Analysis

The vulnerability allows attackers to execute arbitrary JavaScript code in the context of the victim's session, leading to theft of session tokens. This can result in unauthorized access to user accounts, including admin accounts, potentially compromising sensitive data and control over the Open WebUI platform.

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Mitigation Strategies

To mitigate this vulnerability, immediately upgrade Open WebUI to version 0.6.37 or later, where the Stored XSS vulnerability in the Notes PDF download functionality is fixed. Additionally, avoid importing untrusted Markdown files containing SVG tags into Notes, and restrict access to authenticated users to reduce risk.

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