# CVE-2026-120333: Broken Access Control in extension "Frontend User Registration" (sf_register)

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

The actions linked in the emails of the extension (e.g. to confirm a registration or the deletion of an account) do not reject requests with a missing or invalid hash. Instead, the frontend user given in the request is used. Unauthenticated attackers can therefore perform these actions for arbitrary active frontend users. This allows them to retrieve the email address or username of all frontend users and to delete arbitrary frontend user accounts.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- TYPO3 / Extension "Frontend User Registration" (evoweb/sf-register): ≥ 14.0.0; < 14.0.3 (affected, semver); ≥ 0; < 13.2.5 (affected, semver). Source: CNA: TYPO3

## Severity and prioritization

- CVSS 4.0: 8.8 (high); 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; source: CNA: TYPO3

- CVSS 4.0: 8.8 (high); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: f4fb688c-4412-4426-b4b8-421ecf27b14a

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://typo3.org/security/advisory/typo3-ext-sa-2026-038 (CNA: TYPO3; vendor-advisory)

- https://typo3.org/security/advisory/typo3-ext-sa-2026-038 (f4fb688c-4412-4426-b4b8-421ecf27b14a)

## Provenance

- CNA: TYPO3: https://www.cve.org/CVERecord?id=CVE-2026-120333; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120333; retrieved 2026-11-03; source updated 2026-11-03

Revision: 8483f83e2bc3bd72b8b02e7d1a0a968971b9bf4116d73881dd4d2501c4091d42

Canonical: https://y2.dev/cve/CVE-2026-120333

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