{"id":6277,"date":"2025-07-17T08:45:42","date_gmt":"2025-07-17T08:45:42","guid":{"rendered":"https:\/\/avacysolution.com\/?p=6277"},"modified":"2025-07-31T08:54:32","modified_gmt":"2025-07-31T08:54:32","slug":"cross-domain-cookie-consent-cose-e-come-funziona","status":"publish","type":"post","link":"https:\/\/avacysolution.com\/en\/blog\/gdpr\/cross-domain-cookie-consent-cose-e-come-funziona\/","title":{"rendered":"Cross-Domain Cookie Consent: cos\u2019\u00e8 e come funziona"},"content":{"rendered":"

Ah, cookies<\/strong>! Those little text files that make our online experience smoother and more personalized. But with growing concerns about privacy, managing cookie consent across different domains<\/strong> has become quite a headache. That\u2019s where comes into play the Cross-Domain Cookie Consent<\/strong>. But is it actually allowed under privacy laws? And how can we implement it without losing our minds? Let\u2019s find out together.<\/p>\n\n\n\n

Consent for cross-domain cookies: what is it?<\/h2>\n\n\n\n
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One of the fundamental aspects of personal data protection<\/strong> is obtaining users' informed consent<\/strong> for the collection and processing of their information.

Most privacy regulations<\/strong>, including the GDPR, state that without<\/strong> explicit consent<\/strong> for the use of cookies<\/a>, websites cannot collect users\u2019 personal data<\/strong>.

Moreover, under these regulations, every individual has the right to choose<\/strong> which information may be collected<\/strong>, used<\/strong> and shared <\/strong>by companies for commercial purposes.

The most common method for obtaining cookie consent<\/strong> is through a e-commercecookie banners<\/a>, which is displayed to users on their first visit to a website.

If a company manages multiple websites with different domains<\/strong> or uses multiple subdomains<\/strong>, sharing consent across domains becomes a useful solution.

Cross-Domain Cookie Consent is the mechanism used to obtain a user\u2019s consent<\/strong> regarding the use of cookies<\/strong> across multiple domains <\/strong>owned by the same entity or company<\/strong>.

This feature ensure that preferences are expressed only once for each instance<\/strong> owned by the platform<\/strong>, avoiding the need to accept or reject cookies every time they visit a related site. Without this option, users would be forced to repeat the consent process<\/strong> each time they navigate from one domain to another, which would negatively affect the user experience.<\/p>\n\n\n\n

Therefore, cross-domain cookie consent makes it possible to show the cookie banner only<\/strong> during the initial visit <\/strong>and it will not appear again on subsequent visits to other related websites.<\/p>\n\n\n\n

Website owners can, thus, save and store a user\u2019s preferences across multiple linked domains<\/strong>. So, if cross-domain cookie consent is enabled, a user\u2019s full acceptance or rejection of cookies will be applied to all related sites<\/strong>. However, if the user accepts only certain categories of cookies (e.g., functional cookies), the same choice will be maintained across all linked domains.<\/p>\n\n\n\n

This is an especially important aspect to consider when configuring a cookie banner<\/strong> for multiple sites.<\/p>\n\n\n\n

How does it work?<\/h3>\n\n\n\n

The Cross-Domain Cookie Consent works by having a primary domain collect<\/strong> the user\u2019s consent through a banner<\/strong> displayed upon visiting the website. If the user accepts or rejects the use of cookies, their choice is saved in a cookie or in local storage.<\/p>\n\n\n\n

This preference is then shared<\/strong> across the various websites owned by the same company<\/strong>, even if they belong to different domains, so that the user\u2019s choice is respected without prompting for consent again.<\/p>\n\n\n\n

Is synchronizing consent across domains allowed under privacy laws?<\/h2>\n\n\n\n

The short answer is: it depends<\/strong>. Privacy regulations, such as the GDPR<\/strong> in Europe, require that users give explicit consent before their data can be collected or shared.<\/p>\n\n\n\n

If you manage multiple domains<\/strong> with identical cookie configurations and users have given explicit consent on one of them, it is possible to extend that consent to the other related domains<\/strong>. However, if your domains use different cookies - especially third-party ones - cross-domain consent may not be valid.<\/p>\n\n\n\n

Moreover, rules vary from country to country<\/strong>: some privacy authorities require consent to be collected separately for each domain, while others accept shared consent as long as it is properly communicated to the user<\/strong>.<\/p>\n\n\n\n

For this reason, it is essential to use a reliable Consent Management Platform (CMP) like Avacy<\/strong>, which can adapt to the various regulations in force.<\/p>\n\n\n\n