ISO 27001 and Cookie Management: Is Your Cookie Banner Part of the ISMS?

Organizations that are ISO/IEC 27001-certified typically have comprehensive procedures in place for information security, supplier management, changes, and periodic audits.

But in the meantime, who’s keeping an eye on what’s happening on the website?

Websites are constantly changing. The marketing team adds a tag, the digital agency publishes a new release, or a plugin starts connecting to an external provider. This can result in new cookies and trackers being created without the security or privacy officer being aware of it.

An organization may therefore have carefully implemented its information security measures, yet personal data may still be processed or shared through its website without anyone noticing.

Does that mean cookie management is part of ISO 27001?

The short answer: ISO 27001 does not set any specific requirements for cookies or cookie banners. However, when websites, personal data, and third-party vendors fall within the scope of the Information Security Management System, cookie management is indeed relevant.

What is ISO/IEC 27001?

ISO/IEC 27001 is the international standard for establishing, implementing, maintaining, and continuously improving an Information Security Management System, usually abbreviated as ISMS.

The standard does not prescribe which technical solution an organization must use. Organizations must identify, assess, and address their information risks on their own. They must then be able to demonstrate that appropriate controls have been selected, implemented, and monitored.

That makes ISO 27001 risk-based.

When a website processes personal data, uses external scripts, or shares data with third parties, those activities may therefore be part of the risk analysis and the ISMS.

An ISO 27001 certificate therefore does not automatically mean that the cookie banner or consent implementation is functioning correctly. It means that the organization has established a management system to systematically manage relevant information risks.

ISO 27001 vs. ISO 27002

ISO/IEC 27001 describes the requirements that an ISMS must meet. ISO/IEC 27002:2022 provides practical guidelines for selecting and implementing information security measures.

Only ISO 27001 is certifiable. ISO 27002 can be used as a practical checklist within the ISMS.

Cookie management may relate to the following topics from ISO 27002, among others:

• inventory of information and other assets;
• supplier management and monitoring;
• legal and contractual obligations;
• privacy and protection of personal data;
• configuration management;
• monitoring activities;
• change management.

The measures an organization actually implements depend on its risk analysis, the scope of the ISMS, and the Statement of Applicability.

Why Cookies Can Pose an Information Risk

Cookies themselves are not always personal data. However, cookies and similar technologies can be used to recognize visitors, track behavior, create profiles, or share information with third parties.

That’s why effective cookie management involves more than just the visibility of a cookie banner.

For example, a website can:

• place marketing cookies before consent is given;
• send data to an unregistered third-party provider;
• activate new tracking after making a change in Google Tag Manager;
• use cookies that are not listed in the cookie policy;
• load external content without assessing the consequences;
• display an outdated privacy policy;
• process consent in a manner different from what the banner communicates to the visitor.

This affects more than just privacy laws. It also affects the management of assets, suppliers, configurations, changes, and information risks.

The Website as Part of Supplier Management

Modern websites make use of a wide range of external services. These include Google, Meta, LinkedIn, YouTube, chat software, A/B testing tools, embedded content, and marketing platforms.

Any external provider can be part of the digital supply chain.

However, a traditional supplier review does not always reveal which suppliers are currently being used through the website. Moreover, this can change without a formal supplier selection process being initiated.

A cookie and provider inventory can therefore help answer questions such as:

• Which external parties are currently active?
• What are they used for?
• Is personal data being transmitted?
• Is permission required for this?
• Is the provider listed in the privacy documentation?
• Who added the provider?
• When was the configuration last checked?

This makes cookie management a practical extension of third-party governance.

A cookie banner is not an ongoing compliance measure

Implementing a Consent Management Platform, such as Cookiebot CMP, is an important step. However, having a CMP does not automatically guarantee that the entire consent layer will continue to function properly.

The CMP manages the visitor’s consent preferences. Its actual behavior also depends on, among other things:

• the implementation of the CMP;
• Google Tag Manager and other tag management systems;
• changes to the website;
• plugins and external scripts;
• the classification of cookies;
• regional banner settings;
• the integration with Consent Mode;
• the actions of marketers, developers, and agencies.

As a result, a properly configured website may once again exhibit discrepancies after a change is made. We also refer to this as “consent drift”: the actual behavior of the consent layer gradually deviates from its intended configuration.

A one-time implementation or annual audit is therefore not always sufficient.

From Annual Audits to Continuous Control Monitoring

ISO 27001 emphasizes monitoring, evaluation, and continuous improvement. This principle can also be applied to the website’s consent layer.

Instead of only conducting checks during an audit, an organization can periodically determine:

• which cookies and trackers are active;
• which third parties receive data;
• whether cookies are placed before consent is given;
• what changes have occurred since the last audit;
• whether the cookie and privacy policy still reflect the actual situation;
• Which issues have been resolved and which are still pending.

This is also known as continuous control monitoring: regularly verifying whether agreed-upon control measures are still functioning as intended.

This provides auditors, security officers, and privacy professionals with verifiable evidence. For web and marketing teams, it offers a practical overview of issues that need to be resolved.

Also relevant to ISO/IEC 27701

ISO/IEC 27701:2025 is also relevant for organizations that want to systematically manage privacy. This standard outlines the requirements for a Privacy Information Management System, or PIMS.

ISO 27701 focuses, among other things, on accountability, privacy risks, and the demonstrable control of personal data processing.

Cookie management can help achieve this by:

• to make online data processing transparent;
• identify external providers;
• to check permissions and tracking;
• to document changes and deviations;
• compare the privacy documentation with the technical reality;
• make reports available for internal controls and audits.

ISO/IEC 29184:2020 focuses even more specifically on online privacy notices and the process by which online consent is sought for the processing of personal data.

None of these standards require the use of a specific cookie tool. However, they do emphasize that online consent, transparency, and the processing of personal data must be managed in a controlled and verifiable manner.

Who is responsible for cookie management?

Cookie management rarely falls entirely within the purview of a single department.

Marketing selects and uses tracking technology. Developers and online agencies implement scripts and changes. Privacy and Legal assess the legal basis and disclosure requirements. Information Security monitors risks, controls, and vendors.

It is precisely at the intersection of these responsibilities that problems can arise.

That is why it is important to note:

• who owns the consent layer;
• who is authorized to make changes;
• who evaluates deviations;
• how often inspections are conducted;
• how incidents are followed up;
• what evidence is retained;
• how this is reported.

Cookie management will therefore not be a separate project handled by Marketing or Legal, but rather a joint governance process.

How can CookieMeister help with this?

CookieMeister was developed as a governance and monitoring layer for organizations that use Cookiebot.

The platform does not replace Cookiebot CMP. It shows whether the consent environment across multiple websites is still functioning as intended.

CookieMeister can help with, among other things:

• centralized monitoring of Cookiebot domains;
• detection of prior-consent issues;
• detection of changes and consent drift;
• list of cookies and third-party providers;
• comparison with privacy documentation;
• reporting of discrepancies and areas of concern;
• collaboration between Web, Marketing, Privacy, and external agencies.

In this way, CookieMeister can assist with the monitoring and documentation of measures that may be relevant to ISO/IEC 27001, ISO/IEC 27002, and ISO/IEC 27701.

CookieMeister does not provide ISO certification and does not guarantee that an organization complies with these standards. It does, however, offer practical insight and evidence regarding an aspect that remains largely overlooked in many ISMS and PIMS environments: the actual functioning of cookies, trackers, consent, and third-party providers on public websites.

Conclusion

ISO 27001 does not contain a separate requirement for cookie banners. However, cookie management cannot automatically be excluded from the ISMS.

As soon as a website processes personal data, uses third-party providers, or introduces relevant information risks, it intersects with privacy, vendor management, configuration management, change management, and monitoring.

The key question is therefore not:

Do we have a cookie banner?

However:

Can we demonstrate that our consent measures are still working as intended?