Does ISO 27001 require an internal audit?
Yes, ISO 27001 requires organisations to conduct regular internal audits of their information security management system. This is stated in Clause 9.2 of the standard, which states that:
The organisation shall conduct internal audits at planned intervals to provide information on whether the ISMS:
- conforms to the organisation's own requirements for its information security management system; and
- meets the requirements of this international standard.
The standard does not specify how often internal audits should be conducted, but it is recommended that they be conducted at least annually.
Internal audits are an important part of maintaining an effective ISMS. They help organisations to identify and address any weaknesses in their ISMS before they are exploited by attackers.
What are ISO 27001 internal audit requirements?
ISO 27001 audit requirements:
- The audit must be conducted by an independent auditor who is qualified to audit ISO 27001.
- The audit must be planned and conducted in accordance with a documented audit methodology.
- The audit must cover all aspects of the ISMS, including risk assessment, information security controls, ISMS documentation, awareness and training, and management review.
- The audit findings must be documented in a report that is submitted to the organisation's management.
Organisations that are certified according to ISO 27001 must also undergo an external audit by a certification body. There are two kinds of external audit, one conducted once annually called a surveillance audit where the ISMS will be reviewed as part of ongoing evaluation and the other known as a full external audit which is more in-depth and conducted every three years.
Benefits of ISO 27001 audit:
- Improved information security posture
- Reduced risk of information security incidents
- Increased compliance with regulations
- Improved customer confidence
- Competitive advantage
If you are considering implementing ISO 27001 or if you are already certified, it is important to ensure that you are conducting regular internal audits. Internal audits are an essential tool for maintaining an effective ISMS and protecting your organisation from information security threats.
Where is an internal audit mandatory?
An internal audit is not required by law or regulation. However, it is a good practice for all organisations to conduct regular internal audits of their information security and other management systems.
In order to comply with ISO 27001, all companies must conduct internal audits, no matter their country or industry.