[MEDIUM] Ibexa Kernel's files with blacklisted extensions can be still saved to drafts

PKSA-3msp-xw4j-3xr3 GHSA-mwvh-p3hx-x4gg

Affected package: ezsystems/ezplatform-kernel

Affected version: >=1.3.0,<1.3.35

Reported by:
GitHub