SB2026110404 - Authorization bypass through user-controlled key in Frontend User Registration extension for TYPO3
Published: November 4, 2026
Security Bulletin ID
SB2026110404
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Authorization bypass through user-controlled key (CVE-ID: CVE-2026-120333)
CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to the actions linked in the emails of the extension do not reject requests with a missing or invalid hash. A remote attacker can retrieve the email address or username of all frontend users and delete arbitrary frontend user accounts.
Remediation
Install update from vendor's website.