A Chrome extension inventory is a list of installed browser extensions and their key details, such as name, ID, permissions, version and source. Administrators use it to see which extensions are present on managed devices, assess risk and control approved or blocked extensions. It helps surface unwanted add-ons and overprivileged browser access.
What Chrome Extension Inventory Tells You
A Chrome extension inventory is not just a list of add-ons, it is a control surface for understanding browser exposure. It shows which extensions exist, who installed them, where they came from, and whether they deserve trust on managed endpoints.
Because extensions can read page content, modify requests, access tabs, and interact with authentication flows, the inventory becomes a practical way to separate useful productivity tools from risky browser privilege.
What Information Belongs in the Inventory
A useful inventory usually includes the extension name, unique ID, version, source, install method, and requested permissions. Those details let administrators distinguish a store-approved extension from a sideloaded or unmanaged one, and they make it possible to compare what is installed against what policy allows.
The most important fields are often the least obvious ones: permissions reveal what the extension can touch, source reveals whether it came from a trusted marketplace or another channel, and version helps identify stale installs that may need review after a security event.
Why Inventory Matters for Browser Risk
Chrome extensions expand the browser's trust boundary, so an inventory helps reveal overprivileged software, unknown publishers, and extension sprawl. That matters because a harmless-looking extension can still become a path to data collection, session theft, or unwanted code execution through the browser's own authority.
Inventory also supports policy decisions such as allowlisting, blocking, and exception handling. Without a complete view, teams often discover risk only after a user installs a questionable add-on or after a trusted extension is compromised upstream.
How Administrators Use It Operationally
Administrators use extension inventory to compare observed installs against approved baselines, investigate unusual sources, and prioritize review of extensions with broad permissions. It also helps them decide whether a browser policy should permit installation by request, restrict silent installs, or block categories of extensions outright.
For managed fleets, the inventory is also a readiness signal: if the organisation cannot answer which extensions are present, it cannot confidently enforce browser extension governance. NHIMG's Browser Extension Security Guide goes deeper on permissions, allowlisting, and risk scoring for this control area.
Risk and Threat Considerations
Browser extensions become risky when they are overprivileged, malicious, hijacked, or installed outside normal governance. A compromised extension can intercept authentication data, alter web content, or exfiltrate information from the browsing session, especially when users assume the extension is benign because it came from a familiar store.
Failure mechanism: The organisation loses visibility into what extensions are installed, who approved them, and what permissions they retain, so a dangerous add-on can persist until it is manually discovered or after damage has already spread.
Impact: The likely result is unmanaged browser access, broader data exposure, and a weaker response path when a browser extension is used as an attack or persistence mechanism.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 addresses the attack and risk surface, while CIS Controls v8, NIST SP 800-53 Rev 5 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-5 — Account Management | Browser extension inventory supports controlled software and access visibility on managed endpoints. |
| Recommendation — Inventory browser extensions and restrict installation to approved software on managed devices. | ||
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | The term is fundamentally about maintaining an accurate inventory of software components on endpoints. |
| AC-6 — Least Privilege | Extension permissions and blocklists directly support limiting excess browser privilege. | |
| Recommendation — Maintain a current inventory of browser extensions and reconcile it against approved baselines. Limit extension permissions to the minimum needed and block overprivileged add-ons. | ||
| NIST CSF 2.0 | ID.AM-01 — Physical Devices and Systems Inventory | Extension inventory is a software inventory practice within broader asset identification and management. |
| Recommendation — Track installed browser extensions as part of endpoint and software asset inventory. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | The inventory exposes extensions that hold excessive browser permissions and should be reviewed for overprivilege. |
| Recommendation — Review extension permissions and remove or restrict overprivileged browser add-ons. | ||
Practitioner Guidance
Why practitioners should care: Extension inventory is the difference between assumed browser trust and verified browser trust. If the inventory is incomplete, policy enforcement is partial, because you cannot reliably block what you cannot see.
What to watch for: Prioritise extensions with powerful permissions, unusual sources, or installs that do not match the approved catalogue. If the inventory shows unexpected add-ons on managed devices, treat that as a governance issue as well as a potential security event.
Practitioner takeaway: Use the inventory as a decision record, not a static report, so extension review, allowlisting, and removal can follow the same authoritative data.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 29, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org