- Release Date: November 12, 2025
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Component: “Modules” (modules)
- Composer Package Name: codingms/modules
- Vulnerability Type: Broken Authentication
- Affected Versions: 4.3.10 and below, 5.0.0 - 5.7.3, 6.0.0 - 6.4.1, 7.0.0 - 7.5.4
- Severity: High
- Suggested CVSS v4.0: AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- References: CVE-2025-12998, CWE-862
Problem Description
The extension provides a feature to login as a frontend user for authenticated backend users by calling a special URL. The implemented access check can however be bypassed, if the extension setting “module.frontendUser.allowNonAdminUsersToLoginAsFrontendUser” is enabled, resulting in an unauthenticated remote user to login as any frontend user.
Solution
Updated versions 4.3.11, 5.7.4, 6.4.2 and 7.5.5 are available from the TYPO3 extension manager, packagist and at
https://extensions.typo3.org/extension/download/modules/4.3.11/zip
https://extensions.typo3.org/extension/download/modules/5.7.4/zip
https://extensions.typo3.org/extension/download/modules/6.4.2/zip
https://extensions.typo3.org/extension/download/modules/7.5.5/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 for providing updated versions of the extension.
General Advice
Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.