Vulnerability · Published May 19, 2026 · Assigned by TYPO3

CVE-2026-46721Broken Access Control in extension "Frontend User Registration" (sf_register)

Medium 6.9

In plain English

A medium-severity authorization bypass via user-controlled key in Extension "Frontend User Registration" from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 69.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The create and edit flows do not restrict which user properties may be submitted and do not enforce access control on the frontend user group assignment. As a result, an attacker can assign an arbitrary frontend user group to a newly registered or edited account, gaining unauthorized access to content and functionality restricted to privileged frontend user groups.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	evoweb/sf-register	14.0.2	GHSA-v348-vr4q-fv9p
Packagist	evoweb/sf-register	13.2.4	GHSA-v348-vr4q-fv9p

Affected products (as reported)

Vendor	Product	Versions
TYPO3	Extension "Frontend User Registration"	14.0.0 – before 14.0.20 – before 13.2.4

Weakness: CWE-915, CWE-639 · Vector: 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

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-009 vendor-advisory