Broken Access Control in Form Framework
Problem
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.
Solution
Update to TYPO3 versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described.
Credits
Thanks to Richie Lee who reported this issue and to TYPO3 contributor Ralf Zimmermann who fixed the issue.
References
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | typo3/cms | >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1, >= 9.0.0, < 9.5.25 | 10.4.14, 11.1.1, 9.5.25 |
| Composer package | typo3/cms-core | >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1, >= 9.0.0, < 9.5.25 | 10.4.14, 11.1.1, 9.5.25 |
| Composer package | typo3/cms-form | >= 8.0.0, < 8.7.40, >= 9.0.0, < 9.5.25, >= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1 | 8.7.40, 9.5.25, 10.4.14, 11.1.1 |
References
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3vg7-jw9m-pc3f
- https://nvd.nist.gov/vuln/detail/CVE-2021-21357
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21357.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21357.yaml
- https://packagist.org/packages/typo3/cms-form
- https://typo3.org/security/advisory/typo3-core-sa-2021-003
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H/E:H/RL:O/RC:C- Weakness (CWE)
CWE-20, CWE-22, CWE-434- Platform
- Composer
- Package
typo3/cms, typo3/cms-core, typo3/cms-form- Disclosed
- 23.03.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3vg7-jw9m-pc3f - CC BY 4.0
Vulnerability history: typo3/cms-form
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 03.2021 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 3
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 4
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Broken Access Control in Form Framework this entry
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