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Actions on Wordpress plugin 'Advanced Custom Fields' vulnerability

Error message

Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in css_injector_init() (line 53 of /prod_service02/web-prod/hpc-web/sites/all/modules/css_injector/css_injector.module).
15/05/2023

Dear Users, 

Regarding the vulnerability CVE-2023-30777 (HPC- NEWS https://www.hpc.cineca.it/center_news/vulnerability-wordpress-plugin-advanced-custom-fields ) please notify us if you used this plugin and upgrade both free and pro plugins to version 5.12.6 (backported) and 6.1.6. 

Best regards, 

HPC User Support @ CINECA