CVE-2021-21357: high-severity vulnerability in TYPO3.CMS
Broken Access Control in Form Framework
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.3epss 1.6%
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 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. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Affected products
TYPO3 · TYPO3.CMSRelated CVEs — TYPO3.CMS
In the same product, most dangerous first.
CVE-2021-21359MEDIUMDenial of Service in Page Error HandlingEPSS 1.7%CVE-2021-21355HIGHUnrestricted File Upload in Form FrameworkEPSS 1.6%CVE-2021-21338MEDIUMOpen Redirection in Login HandlingEPSS 1.1%CVE-2021-21339MEDIUMCleartext storage of session identifierEPSS 0.9%CVE-2021-21370MEDIUMCross-Site Scripting in Content Preview (CType menu)EPSS 0.9%CVE-2021-21340MEDIUMCross-Site Scripting in Content PreviewEPSS 0.9%