CVE-2021-21357
packagist/typo3/cms
Path Traversal
Due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework. In the default configuration of the Form Framework this allows attackers to explicitly allow arbitrary mime-types for file uploads - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, attackers can persist those files in any writable directory of the corresponding TYPO3 installation. A valid backend user account with access to the form module is needed to exploit this vulnerability.
All versions starting from 8.0.0 before 8.7.40, all versions starting from 9.0.0 before 9.5.25, all versions starting from 10.0.0 before 10.4.14, all versions starting from 11.0.0 before 11.1.1
Upgrade to versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 or above.
2021-03-29
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