CVE-2026-47346: Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form…

PriorityP354high7.6CVSS 4.0

AVNACLATPPRLUINVCHVIHVANSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX

EPSS

0.25%

16.5th percentile

Backend users with file write permissions were able to upload form definition files with mixed-case extensions (e.g., .FORM.YAML) to bypass the Form Framework's upload restriction. Maliciously crafted form definition files can be used to execute arbitrary SQL statements, allowing attackers to escalate privileges by creating administrative backend user accounts. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
typo3	cms-core	>= 0 < 10.4.57	10.4.57
typo3	cms-core	>= 11.0.0 < 11.5.51	11.5.51
typo3	cms-core	>= 12.0.0 < 12.4.46	12.4.46
typo3	cms-core	>= 13.0.0 < 13.4.31	13.4.31
typo3	cms-core	>= 14.0.0 < 14.3.3	14.3.3
typo3	cms-form	>= 0 < 10.4.57	10.4.57
typo3	cms-form	>= 11.0.0 < 11.5.51	11.5.51
typo3	cms-form	>= 12.0.0 < 12.4.46	12.4.46
typo3	cms-form	>= 13.0.0 < 13.4.31	13.4.31
typo3	cms-form	>= 14.0.0 < 14.3.3	14.3.3
typo3	typo3_cms	< 10.4.57	10.4.57
typo3	typo3_cms	>= 11.0.0 < 11.5.51	11.5.51
typo3	typo3_cms	>= 12.0.0 < 12.4.46	12.4.46
typo3	typo3_cms	>= 13.0.0 < 13.4.31	13.4.31
typo3	typo3_cms	>= 14.0.0 < 14.3.3	14.3.3

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