CVE-2026-47346: CWE-178 Improper Handling of Case Sensitivity in TYPO3 TYPO3 CMS
Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.
AI Analysis
Technical Summary
CVE-2026-47346 is a vulnerability in TYPO3 CMS related to improper handling of case sensitivity in file extension checks for form definition uploads. Backend users with file write permissions can upload files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restrictions. Maliciously crafted files can then execute arbitrary SQL commands, allowing attackers to escalate privileges by creating administrative backend user accounts. This affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30, and 14.0.0-14.3.2.
Potential Impact
An attacker with backend file write permissions can bypass upload restrictions and execute arbitrary SQL statements, leading to privilege escalation by creating administrative backend user accounts. This compromises the integrity and security of the TYPO3 CMS installation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is confirmed, restrict backend user file write permissions and monitor for suspicious activity related to form definition uploads.
CVE-2026-47346: CWE-178 Improper Handling of Case Sensitivity in TYPO3 TYPO3 CMS
Description
Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.
CVSS v4.0
Score 7.6high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47346 is a vulnerability in TYPO3 CMS related to improper handling of case sensitivity in file extension checks for form definition uploads. Backend users with file write permissions can upload files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restrictions. Maliciously crafted files can then execute arbitrary SQL commands, allowing attackers to escalate privileges by creating administrative backend user accounts. This affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30, and 14.0.0-14.3.2.
Potential Impact
An attacker with backend file write permissions can bypass upload restrictions and execute arbitrary SQL statements, leading to privilege escalation by creating administrative backend user accounts. This compromises the integrity and security of the TYPO3 CMS installation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is confirmed, restrict backend user file write permissions and monitor for suspicious activity related to form definition uploads.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TYPO3
- Date Reserved
- 2026-05-19T12:49:25.966Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a27f83d8dd33fbd8526d7e7
Added to database: 6/9/2026, 11:25:49 AM
Last enriched: 6/9/2026, 11:40:51 AM
Last updated: 6/9/2026, 3:41:04 PM
Views: 7
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