GHSA-xfvg-8v67-j7wpmedium6.8

TypiCMS Core has Stored Cross-Site Scripting (XSS) via SVG File Upload

The advisory, in context

I. Summary

A Stored Cross-Site Scripting (XSS) vulnerability exists in the file upload module of TypiCMS. 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.

II. Vulnerability Details

Vulnerability Type: Stored Cross-Site Scripting (XSS) (CWE-79)
Affected Component: TypiCMS\Modules\Core\Http\Requests\FileFormRequest.php and TypiCMS\Modules\Core\Services\FileUploader.php.
Affected Versions: <= 16.0.5

The vulnerability stems from two main points:

Permissive File Validation: The FileFormRequest explicitly whitelists svg as an allowed MIME type for uploads.
Lack of Content Sanitization: The FileUploader service saves the SVG file to the server without parsing and sanitizing its content to remove potentially malicious elements like <script> tags or on* event handlers.

When the default filesystem disk is set to public, the uploaded SVG file is stored in a publicly accessible directory, making it trivial to access the file via a direct URL and trigger the XSS payload.

III. Proof of Concept (PoC)

Create a Malicious SVG File: Create a file named malicious.svg with the following content. The viewBox attribute is included to bypass the application's parsing bug.

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
    <script>
        // A simple PoC to demonstrate the vulnerability
        alert('XSS in TypiCMS! Your session cookie is: ' + document.cookie);
    </script>
    <text x="10" y="50">If you see this, the script has run.</text>
</svg>

Upload the Malicious File:
- Log in to the TypiCMS admin panel as a user with permissions to upload files.
- Navigate to the "Files" module (e.g., /admin/files).
- Upload the malicious.svg file. The application will accept the file and store it. <img width="2540" height="1217" alt="image" src="https://github.com/user-attachments/assets/beb8ace9-ac39-442c-a2bc-3fbfb09f8c32" /> <img width="1718" height="671" alt="image" src="https://github.com/user-attachments/assets/9cd4a3f8-28e3-4223-8203-7ab292eaf95f" />
Trigger the XSS:
- The application will provide a public URL for the uploaded file, typically in the format http://<your-site>/storage/files/malicious.svg.
- Anyone who navigates to this URL will have the embedded JavaScript executed in their browser.
- An attacker can send this link to a privileged user (e.g., an administrator). When the administrator clicks the link, their session cookies can be stolen, or the attacker can perform actions on their behalf.

IV. Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary JavaScript in the context of the victim's browser. Although the use of the HttpOnly flag on session cookies prevents direct theft of the session ID via document.cookie, the attacker can still achieve a full compromise of the victim's account by performing actions on their behalf.

The impact includes:

Account Takeover via Action Forgery: The attacker's script can make authenticated requests to the application's API from the victim's browser. This allows the attacker to perform any action the victim is authorized to do, such as:
- Creating a new administrator account for the attacker.
- Changing the victim's email address and password.
- Deleting or modifying all content, users, and settings.
Sensitive Information Disclosure: The script can read the content of any page the victim views within the admin panel. This includes lists of users (with names and emails), private application settings, and other sensitive data, which can then be exfiltrated to an attacker-controlled server.
Phishing and Social Engineering: The script can manipulate the admin panel's UI to display fake login forms to trick the user into re-entering their credentials, or redirect them to a malicious website.
Keystroke Logging: The script can capture any information the victim types into forms on the compromised page.

Because the attacker can perform any action as an authenticated administrator, this vulnerability effectively leads to a full application compromise, even without direct access to the session cookie. The risk is High.

V. Recommended Patches and Mitigations

It is recommended to apply a defense-in-depth approach to mitigate this vulnerability.

Primary Fix: Sanitize SVG Content: The most robust solution is to sanitize SVG files upon upload. Before saving the file, it should be parsed to remove all potentially dangerous elements, including <script>, <style>, <foreignObject> tags, and all on* event attributes. This can be achieved using a dedicated SVG sanitization library.
Secondary Fix: Disable SVG Uploads: If SVG uploads are not a critical feature for the application, the simplest and most secure solution is to disable them entirely. This can be done by removing 'svg' from the list of allowed MIME types in TypiCMS\Modules\Core\Http\Requests\FileFormRequest.php.
```
// In FileFormRequest.php
// BEFORE:
$fileRule = 'mimes:jpeg,gif,png,...,svg,...|max:...';

// AFTER:
$fileRule = 'mimes:jpeg,gif,png,...,pdf,...|max:...'; // Removed 'svg'
```
Hardening - Content-Security-Policy (CSP): Implement a strict Content-Security-Policy (CSP) header for the application. A well-configured CSP can prevent the execution of inline scripts, which would mitigate the impact of this XSS vulnerability.
Hardening - Serve User Content from a Separate Domain: Serve all user-uploaded files from a separate, cookie-less domain. This is a highly effective security measure that isolates user-generated content from the main application, preventing scripts from accessing session cookies or interacting with the application's DOM.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

typicms/core Packagist

Ecosystem versions

From 16.0.0 before 16.1.7

Fixed in 16.1.7

34 explicitly affected versions

16.0.0, 16.0.1, 16.0.10, 16.0.11, 16.0.12, 16.0.13, 16.0.14, 16.0.15, 16.0.16, 16.0.17, 16.0.18, 16.0.19, 16.0.2, 16.0.20, 16.0.21, 16.0.22, 16.0.23, 16.0.24, 16.0.25, 16.0.26, 16.0.3, 16.0.4, 16.0.5, 16.0.6, 16.0.7, 16.0.8, 16.0.9, 16.1.0, 16.1.1, 16.1.2, 16.1.3, 16.1.4, 16.1.5, 16.1.6

View affected-version evidence

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typicms/core Packagist

Ecosystem versions

From 15.0.0 before 15.0.29

Fixed in 15.0.29

27 explicitly affected versions

15.0.0, 15.0.10, 15.0.11, 15.0.12, 15.0.13, 15.0.14, 15.0.15, 15.0.16, 15.0.17, 15.0.18, 15.0.19, 15.0.2, 15.0.20, 15.0.21, 15.0.22, 15.0.23, 15.0.24, 15.0.25, 15.0.27, 15.0.28, 15.0.3, 15.0.4, 15.0.5, 15.0.6, 15.0.7, 15.0.8, 15.0.9

View affected-version evidence

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}

typicms/core Packagist

Ecosystem versions

From 14.0.0 before 14.0.27

Fixed in 14.0.27

27 explicitly affected versions

14.0.0, 14.0.1, 14.0.10, 14.0.11, 14.0.12, 14.0.13, 14.0.14, 14.0.15, 14.0.16, 14.0.17, 14.0.18, 14.0.19, 14.0.2, 14.0.20, 14.0.21, 14.0.22, 14.0.23, 14.0.24, 14.0.25, 14.0.26, 14.0.3, 14.0.4, 14.0.5, 14.0.6, 14.0.7, 14.0.8, 14.0.9

View affected-version evidence

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}

typicms/core Packagist

Ecosystem versions

From 13.0.0 before 13.0.9

Fixed in 13.0.9

9 explicitly affected versions

13.0.0, 13.0.1, 13.0.2, 13.0.3, 13.0.4, 13.0.5, 13.0.6, 13.0.7, 13.0.8

View affected-version evidence

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typicms/core Packagist

Ecosystem versions

Earlier releases before 12.0.5

Fixed in 12.0.5

476 explicitly affected versions

1.8.0, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 10.0.0, 10.0.1, 10.0.10, 10.0.11, 10.0.12, 10.0.13, 10.0.14, 10.0.15, 10.0.16, 10.0.17, 10.0.18, 10.0.19, 10.0.2, 10.0.20, 10.0.21, 10.0.22, 10.0.23, 10.0.24, 10.0.25, 10.0.26, 10.0.27, 10.0.28, 10.0.29, 10.0.3, 10.0.30, 10.0.31, 10.0.32, 10.0.33, 10.0.34, 10.0.35, 10.0.36, 10.0.37, 10.0.38, 10.0.39, 10.0.4, 10.0.40, 10.0.41, 10.0.42, 10.0.43, 10.0.44, 10.0.45, 10.0.46, 10.0.47, 10.0.48, 10.0.49, 10.0.5, 10.0.50, 10.0.51, 10.0.52, 10.0.6, 10.0.7, 10.0.8, 10.0.9, 11.0.0, 11.0.1, 11.0.10, 11.0.11, 11.0.12, 11.0.13, 11.0.14, 11.0.15, 11.0.16, 11.0.17, 11.0.18, 11.0.19, 11.0.2, 11.0.20, 11.0.21, 11.0.22, 11.0.23, 11.0.24, 11.0.25, 11.0.26, 11.0.27, 11.0.28, 11.0.29, 11.0.3, 11.0.30, 11.0.31, 11.0.32, 11.0.33, 11.0.34, 11.0.35, 11.0.36, 11.0.37, 11.0.38, 11.0.39, 11.0.4, 11.0.40, 11.0.41, 11.0.42, 11.0.5, 11.0.6, 11.0.7, 11.0.8, 11.0.9, 12.0.0, 12.0.1, 12.0.2, 12.0.3, 12.0.4, 2.5.0, 2.5.1, 2.5.10, 2.5.11, 2.5.12, 2.5.13, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7, 2.5.8, 2.5.9, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5, 2.6.6, 2.7.0, 2.7.1, 2.7.10, 2.7.11, 2.7.12, 2.7.13, 2.7.14, 2.7.15, 2.7.16, 2.7.17, 2.7.18, 2.7.19, 2.7.2, 2.7.20, 2.7.21, 2.7.22, 2.7.23, 2.7.25, 2.7.26, 2.7.27, 2.7.28, 2.7.29, 2.7.3, 2.7.30, 2.7.31, 2.7.32, 2.7.33, 2.7.4, 2.7.5, 2.7.6, 2.7.7, 2.7.8, 2.7.9, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.8.5, 2.8.6, 2.8.7, 2.8.8, 2.8.9, 2.9.0, 2.9.1, 2.9.2, 2.9.3, 3.0.0, 3.0.1, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.14, 3.0.15, 3.0.16, 3.0.17, 3.0.18, 3.0.19, 3.0.2, 3.0.20, 3.0.21, 3.0.22, 3.0.23, 3.0.24, 3.0.25, 3.0.26, 3.0.27, 3.0.28, 3.0.29, 3.0.3, 3.0.30, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.5, 5.0.0, 5.0.1, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.15, 5.0.16, 5.0.17, 5.0.18, 5.0.19, 5.0.2, 5.0.20, 5.0.21, 5.0.22, 5.0.23, 5.0.24, 5.0.25, 5.0.26, 5.0.27, 5.0.28, 5.0.29, 5.0.3, 5.0.30, 5.0.31, 5.0.32, 5.0.33, 5.0.34, 5.0.35, 5.0.36, 5.0.37, 5.0.38, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 6.0.0, 6.0.1, 6.0.10, 6.0.11, 6.0.12, 6.0.13, 6.0.14, 6.0.15, 6.0.16, 6.0.17, 6.0.18, 6.0.19, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.0.9, 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15, 7.0.16, 7.0.17, 7.0.18, 7.0.19, 7.0.2, 7.0.20, 7.0.21, 7.0.22, 7.0.23, 7.0.24, 7.0.25, 7.0.26, 7.0.27, 7.0.28, 7.0.29, 7.0.3, 7.0.30, 7.0.31, 7.0.32, 7.0.34, 7.0.35, 7.0.36, 7.0.37, 7.0.38, 7.0.39, 7.0.4, 7.0.40, 7.0.41, 7.0.42, 7.0.43, 7.0.44, 7.0.45, 7.0.46, 7.0.47, 7.0.48, 7.0.49, 7.0.5, 7.0.50, 7.0.51, 7.0.52, 7.0.6, 7.0.7, 7.0.8, 7.0.9, 8.0.0, 8.0.1, 8.0.10, 8.0.11, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.7, 8.0.8, 8.0.9, 9.0.0, 9.0.1, 9.0.10, 9.0.11, 9.0.12, 9.0.13, 9.0.14, 9.0.15, 9.0.16, 9.0.17, 9.0.18, 9.0.19, 9.0.2, 9.0.20, 9.0.21, 9.0.22, 9.0.23, 9.0.24, 9.0.25, 9.0.26, 9.0.27, 9.0.28, 9.0.29, 9.0.3, 9.0.30, 9.0.31, 9.0.32, 9.0.33, 9.0.34, 9.0.35, 9.0.36, 9.0.37, 9.0.38, 9.0.39, 9.0.4, 9.0.40, 9.0.41, 9.0.42, 9.0.43, 9.0.44, 9.0.45, 9.0.46, 9.0.47, 9.0.48, 9.0.49, 9.0.5, 9.0.50, 9.0.51, 9.0.52, 9.0.53, 9.0.54, 9.0.55, 9.0.56, 9.0.57, 9.0.58, 9.0.59, 9.0.6, 9.0.60, 9.0.61, 9.0.62, 9.0.63, 9.0.64, 9.0.7, 9.0.8, 9.0.9, V2.0.3, v1.8.5, v1.8.6, v1.8.7, v2.0.0, v2.0.1, v2.0.10, v2.0.11, v2.0.12, v2.0.13, v2.0.14, v2.0.15, v2.0.16, v2.0.17, v2.0.18, v2.0.19, v2.0.2, v2.0.20, v2.0.21, v2.0.22, v2.0.23, v2.0.24, v2.0.25, v2.0.26, v2.0.27, v2.0.28, v2.0.29, v2.0.30, v2.0.4, v2.0.5, v2.0.6, v2.0.7, v2.0.8, v2.0.9, v2.1.0, v2.1.1, v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.2.0, v2.2.1, v2.2.2, v2.3.0, v2.3.1, v2.3.2, v2.4.0, v2.4.1, v2.4.10, v2.4.11, v2.4.12, v2.4.13, v2.4.14, v2.4.15, v2.4.16, v2.4.17, v2.4.18, v2.4.19, v2.4.2, v2.4.20, v2.4.21, v2.4.22, v2.4.23, v2.4.24, v2.4.25, v2.4.26, v2.4.27, v2.4.3, v2.4.4, v2.4.5, v2.4.6, v2.4.7, v2.4.8, v2.4.9

View affected-version evidence

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  ]
}

Set up in your agent.

Investigate in your agent.

TypiCMS Core has Stored Cross-Site Scripting (XSS) via SVG File Upload

The advisory, in context

I. Summary

II. Vulnerability Details

III. Proof of Concept (PoC)

IV. Impact

V. Recommended Patches and Mitigations

Affected packages

References