JuliaComputing HTMLSanitizer.jl up to 0.2.0 cross site scripting

Summaryinfo

A vulnerability has been found in JuliaComputing HTMLSanitizer.jl up to 0.2.0 and classified as problematic. This impacts an unknown function. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2025-52561. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in JuliaComputing HTMLSanitizer.jl up to 0.2.0. It has been declared as problematic. Affected by this vulnerability is an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

HTMLSanitizer.jl is a Whitelist-based HTML sanitizer. Prior to version 0.2.1, when adding the style tag to the whitelist, content inside the tag is incorrectly unescaped, and closing tags injected as content are interpreted as real HTML, enabling tag injection and JavaScript execution. This could result in possible cross-site scripting (XSS) in any HTML that is sanitized with this library. This issue has been patched in version 0.2.1. A workaround involves adding the math and svg elements to the whitelist manually.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-52561 since 06/18/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 0.2.1 eliminates this vulnerability. Applying the patch 0c3dc359e4a64c39cac609541945c0518feef040 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• JuliaComputing

Name

• HTMLSanitizer.jl

Version

• 0.1
• 0.2.0

License

• open-source

Website

• Product: https://github.com/JuliaComputing/HTMLSanitizer.jl/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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