TypiCMS up to 16.1.6 SVG Parser cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in TypiCMS up to 16.1.6. This affects an unknown function of the component SVG Parser. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2026-27621. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in TypiCMS up to 16.1.6. It has been declared as problematic. This vulnerability affects an unknown functionality of the component SVG Parser. 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. CVE summarizes:

TypiCMS is a multilingual content management system based on the Laravel framework. A Stored Cross-Site Scripting (XSS) vulnerability exists in the file upload module of TypiCMS prior to version 16.1.7. The application allows users with file upload permissions to upload SVG files. While there is a MIME type validation, the content of the SVG file is not sanitized. An attacker can upload a specially crafted SVG file containing malicious JavaScript code. When another user (such as an administrator) views or accesses this file through the application, the script executes in their browser, leading to a compromise of that user's session. The issue is exacerbated by a bug in the SVG parsing logic, which can cause a 500 error if the uploaded SVG does not contain a `viewBox` attribute. However, this does not mitigate the XSS vulnerability, as an attacker can easily include a valid `viewBox` attribute in their malicious payload. Version 16.1.7 of TypiCMS Core fixes the issue.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-27621 since 02/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 16.1.7 eliminates this vulnerability. Applying the patch d480a0be1e8e7c0600bb9a325bb11920ee66497d 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.

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Productinfo

Type

• Content Management System

Name

• TypiCMS

Version

• 16.1.0
• 16.1.1
• 16.1.2
• 16.1.3
• 16.1.4
• 16.1.5
• 16.1.6

License

• open-source

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