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CVE-2026-15305: Typo3 Early Validator Registrationcve-2026-15305-typo3-early-validator-registration

A validator is being registered or created inside the `initializeFormElement()` lifecycle hook. At this stage in the TYPO3 Form lifecycle, concrete form definition properties (such as `allowedMimeTypes`) have not yet been applied. This causes the validator to use default or incomplete data, completely bypassing intended security restrictions like server-side

PHPCVE-2026-15305CWE-434CWE-436
by Provallyupdated 2026-09-02Apache-2.0
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