Group access reviews: How to review security groups and AD groups at scale

Group access reviews are a critical yet often overlooked aspect of identity security. While most organizations focus on individual user permissions, they frequently neglect to assess whether the groups granting those permissions remain appropriate.

Security groups and Active Directory (AD) groups form the foundation of access control in hybrid environments, but many organizations struggle to review them at scale. Groups often retain members who no longer need access, and permissions can drift from their original intent. Orphaned groups may persist without business justification, leading to unnecessary risk and compliance gaps that auditors frequently identify.

This guide explains the importance of group access reviews and outlines how to implement them effectively across your organization.

What are group access reviews?

Group access reviews evaluate whether security and AD groups still serve their intended purpose and have appropriate membership. Unlike user access reviews, which focus on individual permissions, group access reviews assess group membership, permissions, and ongoing business need.

Security groups are a fundamental feature of any authentication or identity service. They exist within identity providers (IdPs),, in Linux, on mainframes, as well as in cloud environments like Azure, AWS, or Google Cloud. They define who can access specific resources: applications, data, infrastructure, or services. Active Directory groups exist in on-premises environments and hybrid setups, controlling access to Windows resources, file shares, and applications integrated with Active Directory.

Group access reviews are challenging due to their scale and complexities like the nesting capability of groups. Organizations may have hundreds or thousands of groups, many lacking clear ownership or documentation. Some groups are actively managed, while others have not been reviewed in years. Without a systematic approach, comprehensive review is unmanageable.

What’s the difference between group access reviews and user access reviews?

Group access reviews differ from user access reviews in important ways. A user access review asks: does this person still need this access? A group access review asks three questions: Does this group still exist for a valid business reason? Are the right people in this group? Does this group have more permissions than it needs?

Group access reviews have a broader scope than user access reviews. While user reviews focus on application-level access, group reviews span infrastructure, on-premises systems, cloud platforms, and hybrid environments. This wider scope increases both their complexity and impact.

Why group access reviews matter for compliance and security

Regulatory requirements make group access reviews non-negotiable. SOX, HIPAA, PCI DSS, and ISO 27001 all require evidence that access is regularly reviewed and appropriate. In many environments, access is granted through groups, making group-level reviews an essential part of verifying that user access remains appropriate. Auditors expect to see that organizations can validate group membership, confirm that access remains justified, and remove unnecessary permissions.

But compliance is only one aspect. Group access reviews are also essential for security. Overly permissive groups increase risk by expanding the attack surface and potential impact if credentials are compromised. Groups that no longer align with their original purpose may grant inappropriate access to users.

This security risk is evident when considering attacker methods. According to the Verizon 2025 Data Breach Investigations Report, credential abuse now accounts for 22% of breaches, surpassing phishing at 16%. Once credentials are compromised, attackers exploit group memberships and permissions to move laterally. Over-permissive groups accelerate this movement and increase potential damage.

Consider a real scenario: an Active Directory group called "IT-Support" was created five years ago to grant a small team access to file shares and administrative tools. Over time, people joined the group as they rotated into support roles. Some left the organization but were never removed from the group. Some moved to other departments but remained members. The group now has 40 members, many of whom have no current business reason to be there. The group still has the same permissions it was granted years ago, which now exceed what anyone actually needs. An attacker compromises one credential in this group and gains access to resources meant for a much smaller team.

Such scenarios are common in organizations. Regular group access reviews help identify and address these issues before they lead to security incidents.

The three pillars: Security groups, AD groups, and cloud access groups

Organizations typically manage groups across multiple systems and environments. Understanding each group type is essential for comprehensive group access reviews.

Security groups in cloud environments

Cloud security groups exist in Azure, AWS, Google Cloud, and other platforms. They define network access and resource permissions. For example:

• In Azure, security groups control access to applications registered in Azure AD. 
• In AWS, security groups control network traffic to resources like EC2 instances, while IAM roles and groups manage identity access.
• In Google Cloud, groups manage access to resources and services.

Cloud environments introduce additional complexity for group access reviews. Organizations may have hundreds of groups across subscriptions, regions, and projects, and access can also be granted indirectly through mechanisms like role assumption. Without a unified view across systems, comprehensive review remains challenging.

Active Directory groups in on-premises environments

Active Directory (AD) groups are the foundation of access control in Windows environments, granting access to file shares, printers, applications, and other resources. Many organizations have thousands of AD groups, often created years ago and rarely reviewed.

The challenge with AD groups is visibility and coordination. Group membership is often managed by multiple teams. Some groups are created by IT, others by application teams or business units. Documentation is frequently incomplete or outdated. Determining who owns a group or what its current purpose is can be difficult.

Hybrid and cross-platform groups

Most organizations operate hybrid environments with on-premises AD, Azure AD, cloud platforms, and SaaS applications. Groups exist across these systems, and membership may be synchronized or managed separately.

This complexity means group access reviews must span multiple systems. A user might be in an AD group that grants on-premises access, an Azure group that grants cloud access, and a Slack workspace that grants SaaS access. Reviewing their access comprehensively requires visibility across all of these.

Common challenges in group access reviews

Organizations implementing group access reviews face several common obstacles:

Lack of visibility across systems

The first challenge is seeing all groups that exist. Organizations often have groups in multiple systems: on-premises AD, Azure AD, cloud platforms, SaaS applications, and custom systems. Without a unified view, you can't see the complete picture. You end up reviewing groups in one system while missing groups in others.

Unclear group ownership and documentation

Many groups lack clear ownership: Who is responsible for this group? What is its current purpose? Who should be in it? If you can't answer these questions, you can't effectively review the group. Documentation is often incomplete, outdated, or inconsistent. A group created five years ago may have no documentation at all.

Stale group membership

Group membership often becomes stale over time. People join when they need access and are supposed to be removed when they don't. In practice, removal often doesn't happen. They move to other departments or leave the organization, but their group membership remains. Over time, groups accumulate members who have no current business reason to be there.

Difficulty determining what groups should contain

Even with visibility into group membership, determining appropriate members is challenging without clear criteria. This often leads to superficial reviews without meaningful evaluation.

Coordination across teams

Group access reviews often require coordination among multiple teams. Security groups may grant access to resources across departments or applications, making stakeholder coordination time-consuming and prone to errors.

Scaling reviews across the organization

As organizations grow, the number of groups grows. Manually reviewing hundreds or thousands of groups is impractical. Most organizations don't have the resources to review all groups regularly. They end up reviewing a subset, which leaves gaps in coverage.

Group access review best practices

Implementing group access reviews effectively requires a structured approach.

Establish clear group ownership

Start by assigning clear ownership to each group. Who is responsible for this group? Make it explicit. The owner should understand the group's purpose, know who should be in it, and be accountable for maintaining it. Without clear ownership, groups drift.

Document group purpose and membership criteria

For each group, document its purpose: Why does this group exist? What business need does it serve? Document the criteria for membership: Who should be in this group? What role or department should they have? This documentation becomes the standard against which you evaluate current membership.

Conduct periodic reviews on a schedule

Don't review groups once and assume they're correct. Establish a review schedule. Annually is common for most groups. High-risk groups (those with broad permissions or many members) may warrant more frequent reviews. Low-risk groups may be reviewed less frequently. The key is having a schedule and sticking to it.

Use data to inform reviews

Base reviews on actual usage data rather than assumptions. Identify which members actively use group resources and which have not accessed them recently. This information supports informed membership decisions.

Implement a formal approval process

Group access reviews should include a formal approval process. The group owner reviews current membership against documented criteria. They approve members who should remain or recommend removal for members who shouldn't. A security team or compliance officer verifies that the review was conducted and approvals were documented. This creates an audit trail.

Automate where possible

Automate group access reviews where possible. Use automation to collect membership data, identify groups overdue for review, and flag unusual groups. Automation enhances speed and thoroughness but does not replace human judgment.

Address findings systematically

When group access reviews identify issues, address them systematically. Remove members who shouldn't be there. Update documentation. Adjust permissions if groups have more access than they need. Track remediation to verify issues are actually resolved.

Common findings in group access reviews

Organizations consistently identify several common issues during group access reviews.

Stale group membership

Stale membership is the most common finding. Groups often include members who have left the organization, changed departments, or no longer require access but were not removed.

Over-permissioned groups

Many groups have accumulated more permissions than necessary, often exceeding their original purpose as additional access is granted over time.

Orphaned groups

Some groups persist after their business purpose has ended, such as completed projects or reorganized departments, consuming resources and increasing risk.

Undocumented groups

Groups without documentation, ownership, or membership criteria are common and difficult to review, as their intended purpose and appropriate membership are unclear.

Duplicate groups

Organizations often have multiple groups that serve similar purposes. This redundancy creates confusion and makes management harder. Consolidating duplicate groups simplifies access control.

Groups with excessive permissions

Some groups have permissions that exceed member needs, such as organization-wide access for a specific team. Limiting permissions to actual requirements reduces risk.

How to review security groups and AD groups at scale

A systematic approach that combines automation with human judgment is essential for reviewing groups at scale.

1. Discover and inventory all groups

Begin by discovering all existing groups across cloud platforms, on-premises environments, and SaaS applications. Use automated tools to create a comprehensive inventory, documenting each group's name, system, owner, and membership.

2. Establish baseline documentation

Document each group's purpose and membership criteria. For existing groups, consult the owner or managing team. Require documentation for new groups before creation. This baseline guides future reviews.

3. Collect usage data

Determine which group members actually use the resources the group grants access to. Collect data on who accesses what resources and how frequently. This data informs review decisions by showing which members are active and which are inactive.

4. Distribute reviews to owners

Don't conduct all reviews centrally. Distribute them to group owners and resource owners. They understand the business context better than a centralized team. Provide them with current membership, usage data, and documented criteria. Ask them to confirm that membership is appropriate.

5. Aggregate and analyze results

Aggregate review results from all owners and analyze for patterns, such as stale membership or excessive permissions. Use these insights to prioritize remediation efforts.

6. Remediate findings

Systematically address findings by removing inappropriate members, updating documentation, adjusting permissions, and decommissioning groups that no longer serve a purpose.

7. Create audit trail and report

Document the entire review process, including reviewers, decisions, and review dates. Create compliance reports to demonstrate that reviews were conducted, documented, and approved for audit purposes.

Group access reviews vs. user access reviews

Group and user access reviews are complementary but distinct. Understanding their differences enables effective implementation of both processes.

User access reviews focus on individual users and their permissions. Does this person have the right access for their current role? Are there permissions they no longer need? User access reviews are typically conducted annually and focus on application-level access.

Group access reviews assess whether groups are still needed, have current membership, and appropriate permissions. They typically span infrastructure, on-premises systems, and cloud platforms, focusing on the foundations of access control.

Both are important. User access reviews catch cases where individuals have accumulated unnecessary permissions. Group access reviews catch cases where groups themselves are misconfigured, over-permissioned, or stale. Together, they provide comprehensive coverage of access control.

Tools and automation for group access reviews

Several approaches can automate and streamline group access reviews.

Identity governance platforms

Modern identity governance platforms provide unified visibility across systems and automate group access reviews. They discover all groups, collect membership data, provide usage analytics, and facilitate the review process. They create audit trails and generate compliance reports. Platforms that include intelligent analysis can flag groups that warrant review based on risk factors like size, permissions, or membership changes.

Directory services and cloud platform tools

Cloud platforms and directory services provide native tools for group management. Azure AD provides tools for reviewing group membership. AWS provides tools for reviewing security group permissions. These tools are often limited to their specific platform but can be part of a broader review strategy.

Custom scripts and APIs

Some organizations build custom solutions using APIs from their various systems. Scripts can collect group data from multiple sources, identify groups that haven't been reviewed, and generate reports. This approach is flexible but requires technical expertise to build and maintain.

Spreadsheet-based processes

Some organizations still use spreadsheets to track groups and manage reviews. While this approach works for small numbers of groups, it doesn't scale. Spreadsheets are error-prone and don't provide real-time visibility or automated workflows.

The most effective approach combines automated discovery and data collection with intelligent analysis and formal review processes. Tools should provide unified visibility across systems, collect usage data to inform reviews, and create audit trails that demonstrate compliance.

Getting started with group access reviews

To begin implementing group access reviews, follow these steps:

1. Assess your current state by identifying the number of groups, their locations, ownership, documentation, and review frequency.
2. Prioritize high-risk groups, such as those with broad permissions, large membership, or critical resource access, and review them first.
3. Establish ownership. Assign clear owners to each group. Make it explicit who is responsible for maintaining the group and approving membership changes.
4. Document each group's business purpose and membership criteria to establish review standards.
5. Conduct initial reviews by comparing current membership to documented criteria. Remediate issues by removing stale members, updating documentation, and adjusting permissions.
6. Establish a review schedule. Determine how frequently each group should be reviewed. Annual reviews are common, but high-risk groups may warrant more frequent reviews.
7. Implement automation for discovery, data collection, and reporting to increase efficiency and scalability.
8. Create an audit trail by documenting the review process, decisions, and remediation to provide compliance evidence.

How group access reviews strengthen identity security posture

Group access reviews are essential for strong identity security. They reduce risk by facilitating proper group configuration and maintenance, provide compliance evidence, and scale effectively through automation and human oversight.

Organizations benefit from group access reviews by reducing unnecessary access, identifying stale memberships early, aligning groups with business needs, and generating audit-ready evidence of access control.

Investing in group access reviews delivers value through risk reduction and compliance efficiency. Evaluate solutions that offer unified visibility, automate discovery and data collection, and support scalable review and approval processes.

Ready to enhance your group access reviews? Oleria offers unified visibility, automated discovery and data collection, and scalable group access reviews. With usage-based intelligence and audit trail features, organizations can reduce risk and demonstrate compliance. Schedule a demo with Oleria to learn more.

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