TI-2026-84203 Aliases CVE-2026-120333 GHSA-8m82-x5v9-mxhw

Broken access control in TYPO3 Frontend User Registration extension

MEDIUM 44CWE-639Published 2026-11-03 · Updated 2026-11-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

TYPO3 extension "Frontend User Registration" (sf_register) from 0 before 13.2.5 and from 14.0.0 before 14.0.3 does not reject requests with a missing or invalid hash in the action links sent by its emails. An unauthenticated remote attacker can act on arbitrary active frontend users, retrieving their email addresses or usernames and deleting their accounts. This is a broken access control flaw tied to CWE-639.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00387 33rd percentileScored 2026-11-07

Fix Fixed Extension "Frontend User Registration" (TYPO3): 14.0.3, 13.2.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TYPO3	Extension "Frontend User Registration"	14.0.0 to before 14.0.3; before 13.2.5	14.0.3, 13.2.5	Patch available	CNA

Extension "Frontend User Registration" VendorTYPO3 Affected 14.0.0 to before 14.0.3; before 13.2.5 Fixed in 14.0.3, 13.2.5 Patch available CNA

Remediation

Update the extension to version 14.0.3 for TYPO3 14 or to version 13.2.5 for TYPO3 13.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Fix · CNA Extension "Frontend User Registration" (TYPO3) Fixed in 14.0.3, 13.2.5

Timeline

2026-11-03 Threatist record created from CVE-2026-120333
2026-11-03 Alias added: GHSA-8m82-x5v9-mxhw
2026-11-03 CISA SSVC decision points changed

References

Advisory 1

https://typo3.org/security/advisory/typo3-ext-sa-2026-038

TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0

See all 411 →

Sources

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