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TI-2021-04455 Aliases CVE-2021-21355GHSA-2r6j-862c-m2v2

Unrestricted File Upload in Form Framework

Priority MEDIUM 41CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution, Information disclosure
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-434 and CWE-552.

Summary

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, _UploadedFileReferenceConverter_ transforming uploaded files into proper FileReference domain model objects handles possible file uploads for other extensions as well - given those extensions use the Extbase MVC framework, make use of FileReference items in their direct or inherited domain model definitions and did not implement their own type converter. In case this scenario applies, _UploadedFileReferenceConverter_ accepts any file mime-type and persists files in the default location. In any way, uploaded files are placed in the default location _/fileadmin/user_upload/_, in most scenarios keeping the submitted filename - which allows attackers to directly reference files, or even correctly guess filenames used by other individuals, disclosing this information. No authentication is required to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.

Why it matters now

EPSS 0.01631 76th percentileScored 2026-11-07
Fix Fixed typo3/cms-form (Packagist): 8.7.40, 9.5.25, 10.4.14 +1typo3/cms-core (Packagist): 10.4.14, 11.1.1, 9.5.25+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TYPO3TYPO3.CMS8.0.0 – 8.7.39; 9.0.0 – 9.5.24; 10.0.0 – 10.4.13; 11.0.0 – 11.1.0—No fix listedCNA
—typo3/cms-form (Packagist)8.0.0 to before 8.7.408.7.40Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-form (Packagist)9.0.0 to before 9.5.259.5.25Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-form (Packagist)10.0.0 to before 10.4.1410.4.14Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-form (Packagist)11.0.0 to before 11.1.111.1.1Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-core (Packagist)10.0.0 to before 10.4.1410.4.14Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-core (Packagist)11.0.0 to before 11.1.111.1.1Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms-core (Packagist)9.0.0 to before 9.5.259.5.25Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms (Packagist)10.0.0 to before 10.4.1410.4.14Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms (Packagist)11.0.0 to before 11.1.111.1.1Patch availableGHSA-2r6j-862c-m2v2
—typo3/cms (Packagist)9.0.0 to before 9.5.259.5.25Patch availableGHSA-2r6j-862c-m2v2
  • TYPO3.CMS VendorTYPO3 Affected 8.0.0 – 8.7.39; 9.0.0 – 9.5.24; 10.0.0 – 10.4.13; 11.0.0 – 11.1.0 Fixed in — No fix listed CNA
  • typo3/cms-form (Packagist) Vendor— Affected 8.0.0 to before 8.7.40 Fixed in 8.7.40 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-form (Packagist) Vendor— Affected 9.0.0 to before 9.5.25 Fixed in 9.5.25 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-form (Packagist) Vendor— Affected 10.0.0 to before 10.4.14 Fixed in 10.4.14 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-form (Packagist) Vendor— Affected 11.0.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-core (Packagist) Vendor— Affected 10.0.0 to before 10.4.14 Fixed in 10.4.14 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-core (Packagist) Vendor— Affected 11.0.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms-core (Packagist) Vendor— Affected 9.0.0 to before 9.5.25 Fixed in 9.5.25 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms (Packagist) Vendor— Affected 10.0.0 to before 10.4.14 Fixed in 10.4.14 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms (Packagist) Vendor— Affected 11.0.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-2r6j-862c-m2v2
  • typo3/cms (Packagist) Vendor— Affected 9.0.0 to before 9.5.25 Fixed in 9.5.25 Patch available GHSA-2r6j-862c-m2v2

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*8.0.0 to before 8.7.40; 9.0.0 to before 9.5.25; 10.0.0 to before 10.4.14; 11.0.0 to before 11.1.1VulnerableTYPO3
  • cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.7.40; 9.0.0 to before 9.5.25; 10.0.0 to before 10.4.14; 11.0.0 to before 11.1.1 Vulnerable ·TYPO3

Remediation

  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-form (Packagist) Fixed in 8.7.40 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-form (Packagist) Fixed in 9.5.25 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-form (Packagist) Fixed in 10.4.14 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-form (Packagist) Fixed in 11.1.1 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-core (Packagist) Fixed in 10.4.14 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-core (Packagist) Fixed in 11.1.1 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms-core (Packagist) Fixed in 9.5.25 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms (Packagist) Fixed in 10.4.14 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms (Packagist) Fixed in 11.1.1 Advisory →
  • Fix · GHSA-2r6j-862c-m2v2 typo3/cms (Packagist) Fixed in 9.5.25 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21355
  2. 2026-10-03 Alias added: GHSA-2r6j-862c-m2v2

References

Advisory 4

Other 2

  • TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
  • TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
  • TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
  • TI-2009-00241 The Indexed Search Engine (indexed_search) system extension in TYPO3 4.0.0 through 4.0.9… CVSS 2.0HIGH 10.0
  • TI-2020-08940 Improperly Controlled Modification of Dynamically-Determined Object Attributes in TYPO3 CMS CVSS 3.1CRITICAL 10.0
  • TI-2011-03994 Improper authentication in TYPO3 CVSS 3.1CRITICAL 9.8
See all 217 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences