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Servers and applications

CVE-2021-21355

Unrestricted File Upload in Form Framework

Severity
High 8.6
Published
16 Mar 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
8.7.40, 9.5.25, 10.4.14, 11.1.1
Also known as
GHSA-2r6j-862c-m2v2
Sources
NVD, Project advisories (GitHub)

Description

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 the lack of ensuring file extensions belong to configured allowed mime-types, attackers can upload arbitrary data with arbitrary file extensions - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that,…

Affected software

SoftwareAffected versions
TYPO3Servers and applications · cpe:a:typo3:typo3
  • From 8.0.0 before 8.7.40
  • From 9.0.0 before 9.5.25
  • From 10.0.0 before 10.4.14
  • From 11.0.0 before 11.1.1
TYPO3Servers and applications · github:typo3/typo3
  • From 11.0.0 before 11.1.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21355
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21355
  • GitHub Advisory Database https://github.com/advisories/GHSA-2r6j-862c-m2v2
  • github.com https://github.com/TYPO3/typo3/security/advisories/GHSA-2r6j-862c-m2v2