Yes. Extensions operate with delegated access to browser sessions, which makes them a form of shadow identity inside the user environment. If they can reach authentication state or manipulate web content, they belong in the same governance conversation as privileged access and non-human identity controls.
Why This Matters for Security Teams
Browser extensions sit inside the authenticated browser session, where they can read page content, inject scripts, capture tokens, and alter transactions. That makes them materially different from ordinary software inventory: they behave like delegated identities with standing access to the user’s web environment. In practice, they should be assessed alongside privileged access, OAuth grants, and other non-human identities rather than treated as harmless productivity add-ons. NIST’s NIST Cybersecurity Framework 2.0 reinforces that identity, access, and continuous monitoring are core security outcomes, not optional controls.
NHIMG’s Ultimate Guide to NHIs shows how frequently identity sprawl turns into exposure: 97% of NHIs carry excessive privileges, and 80% of identity breaches involved compromised non-human identities such as service accounts and API keys. Browser extensions create a similar governance problem inside the endpoint and browser layer, especially when they can access authentication state or manipulate content across SaaS applications. In practice, many security teams encounter extension-driven abuse only after a session is already hijacked or a web workflow has already been modified, rather than through intentional identity governance.
How It Works in Practice
Governance starts with recognizing that an extension is not just code, but an actor with scoped access to browser state. If an extension can view cookies, intercept requests, alter DOM content, or access SSO sessions, it should be assigned an owner, a risk tier, and a review cycle. Current guidance suggests treating high-risk extensions like other delegated identities: approve them by business need, restrict them by policy, and remove them when the workflow ends.
Practically, that means tying extension inventory to identity and device management, then evaluating permissions against the minimum required function. Security teams should review:
- Requested browser permissions and whether they include broad host access
- Who approved the extension and which business process depends on it
- Whether the extension can read authentication state, form fields, or session data
- Whether updates are signed, monitored, and centrally controlled
- Whether the extension is installed from an approved catalog or side-loaded
Browser governance becomes stronger when it is paired with continuous monitoring of OAuth apps and session activity. NHIMG research on The State of Non-Human Identity Security reports that 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, which is a close analogue to the blind spots created by unmanaged extensions. On the control side, NIST Cybersecurity Framework 2.0 supports continuous inventory, least privilege, and anomaly detection as the operational baseline. These controls tend to break down when unmanaged extensions are allowed in developer, finance, or support browsers because those environments combine high-value sessions with broad web access.
Common Variations and Edge Cases
Tighter extension control often increases friction for users, requiring organisations to balance productivity against session risk. That tradeoff is real, especially in teams that rely on browser plugins for password management, ticketing, or internal portals. Best practice is evolving here: there is no universal standard for treating every extension as a full identity object, but there is strong consensus that extensions with access to authentication state or sensitive web content belong in governance scope.
Some edge cases need special handling. Extensions used only for rendering or theme changes may have low risk, while extensions with omnibox access, clipboard access, or broad site permissions deserve deeper review. Developer tools and enterprise SSO helpers can be legitimate, but they should still be subject to allowlisting, telemetry, and offboarding when no longer needed. The Top 10 NHI Issues and the 52 NHI Breaches Analysis both reinforce a common pattern: excess privilege and weak visibility matter more than the label attached to the identity. For browser extensions, that means governance should focus on delegated capability, session reach, and revocation speed rather than on whether the extension is branded as “security” or “productivity.”
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 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Browser extensions act like delegated non-human identities with session reach. |
| NIST CSF 2.0 | PR.AC-4 | Extension access must be limited and continuously reviewed as part of identity governance. |
| NIST AI RMF | Human and automated decision accountability applies to browser-mediated access paths. |
Inventory extensions, scope permissions, and revoke any add-on that exceeds documented business need.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on June 9, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
