Improper access control in the newsletter module (see GHSA-3r9g-pfhv-3228)

PKSA-ws7m-s1y9-vkw6

Affected package: contao/contao

Affected version: >=5.0.0,<5.3.50|>=5.4.0,<5.7.12

Reported by:
FriendsOfPHP/security-advisories