Article 19 includes a notification obligation, which should not be confused with the specific personal data breach notification obligation (article 33). It is a mechanism that gives full effect to other provisions of the General Data Protection Regulation, ensuring that third parties are informed about actions taken by the controller regarding personal data (recital 66).

ISO/IEC 27701, adopted in 2019, added additional ISO/IEC 27002 guidance for PII controllers.

Here is the relevant paragraph to article 19 GDPR:

7.3.7 PII controllers’ obligations to inform third parties

Control

The organization should inform third parties with whom PII has been shared of any modification, withdrawal or objections pertaining to the shared PII, and implement appropriate policies, procedures and/or mechanisms to do so.

Implementation guidance

The organization should take appropriate steps, bearing in mind the available technology, to inform third parties of any modification or withdrawal of consent, or objections pertaining to the shared PII.