TYPO3-EXT-SA-2026-033: Multiple vulnerabilities in extension "TYPO3 Fluid-Form" (fluid_form)

• Release Date: October 20, 2026
• Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
• Component: "TYPO3 Fluid-Form by coding.ms" (fluid_form)
• Composer Package Name: codingms/fluid-form
• Vulnerability Type: Broken Access Control, Cross-Site Scripting
• Affected Versions: 5.0.9 and below, 6.0.0 - 6.0.5
• Severity: Medium
• Suggested CVSS v4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
• References: CVE-2026-112240, CVE-2026-113442, CWE-639, CWE-338, CWE-79

Problem Description

The download link for files uploaded through a form relied on a token that could be predicted. The file name in the request was also not verified in a way that resisted guessing. An unauthenticated attacker could use this to access files uploaded by other visitors. In addition, the token was shown in plain text in the text version of the notification email. (CVE-2026-112240)

Values entered by visitors were placed into the HTML summary email without being escaped. An unauthenticated attacker could use this to inject HTML into an email that is shown to the recipient. (CVE-2026-113442)

Solution

Updated versions 5.0.10 and 6.0.6 are available from the TYPO3 extension manager, packagist and at

https://extensions.typo3.org/extension/download/fluid_form/5.0.10/zip
https://extensions.typo3.org/extension/download/fluid_form/6.0.6/zip

Users of the extension are advised to update the extension as soon as possible.

Credits

Thanks to Thomas Deuling for reporting the vulnerability and providing updated versions of the extension.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide.