Authorization bypass through user-controlled key in Frontend User Registration - CVE-2026-46721
Published: May 27, 2026
Vulnerability identifier: #VU132374
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46721
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: TYPO3
Affected software:
Frontend User Registration
Frontend User Registration
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to authorization bypass through user-controlled key within create and edit flows. A remote attacker can assign an arbitrary frontend user group to a newly registered or edited account.
How to mitigate CVE-2026-46721
Install updates from vendor's website.