Who should be accountable for malicious extension publishing workflows?

Why This Matters for Security Teams

Malicious extension publishing is not just a browser governance issue. It is an identity and privilege issue because the publishing action itself can introduce code into managed endpoints, alter user workflows, and create a hidden path to data access. Accountability therefore belongs to the teams that govern privileged access, approval workflows, endpoint enforcement, and audit evidence. NIST control families such as NIST SP 800-53 Rev 5 Security and Privacy Controls remain useful because they treat change control, logging, and least privilege as core security obligations rather than optional hygiene.

Security teams often get this wrong by assuming the browser store or extension platform is the sole owner of risk. In practice, the real control point is the internal workflow that decides who can publish, approve, or update an extension and whether those actions are visible to security operations. If that workflow is loosely governed, a legitimate account can be used to ship malicious behavior without triggering the same scrutiny applied to infrastructure or SaaS admin changes. In practice, many security teams encounter this only after an extension has already been used to exfiltrate data or redirect users, rather than through intentional review of the publishing path.

How It Works in Practice

Accountability should be assigned across the control chain, not to a single team. Product owners may define the business purpose of the extension, but identity and access teams should control who can publish, modify, or sign the package. Security operations should monitor publishing events, review anomalous changes, and retain evidence. Endpoint teams should enforce allowlisting, block unapproved installs, and verify that browser policy aligns with enterprise risk appetite.

A practical operating model usually includes:

• Privileged publishing access tied to named identities, not shared accounts.
• Approval workflows for new releases and permission changes.
• Logging for uploads, code signing, manifest changes, and permission scope expansion.
• Periodic review of who can publish and who can approve exceptions.
• Detection for suspicious extension behavior after release, including data access and network calls.

This is where identity governance matters most. If the publishing role is overprivileged or weakly reviewed, the workflow becomes a standing administrative channel. That is especially important when browser extensions can request broad access to pages, sessions, and tokens, because the extension runtime may effectively become an identity-adjacent control plane. Guidance from the CISA browser extension security guidance is useful here, alongside standard change-management and logging controls.

For stronger assurance, organisations should treat extension publishing like any other high-risk release path: separate duties, require approval for elevated permissions, and correlate publishing events with IAM and endpoint telemetry. If an extension supports sensitive workflows, security review should include source integrity, dependency trust, and post-release behavioral checks. These controls tend to break down when publishing is outsourced to a vendor team or marketing group because privilege ownership, technical review, and incident response are split across teams with different incentives.

Common Variations and Edge Cases

Tighter publishing control often increases release friction, requiring organisations to balance rapid browser updates against the need for verified change management. That tradeoff becomes more visible in fast-moving product teams, open-source extension ecosystems, and environments that rely on self-service publishing for internal tools.

There is no universal standard for this yet, so current guidance suggests using the same accountability model you would apply to privileged cloud changes or CI/CD release approvals. In some environments, the security team should own the control framework while engineering owns implementation. In others, IAM or PAM teams may administer the approval gates, with application owners supplying business justification. The key is that no single developer should be able to publish a high-risk extension without oversight.

Edge cases also arise when extensions are used for automation, agentic workflows, or helper tools that interact with sensitive systems. In those cases, extension publishing intersects with NHI governance because the extension may carry tokens, API keys, or delegated access that behaves like a non-human identity. If that trust boundary is not explicit, incident response often starts too late, after the extension has already propagated through approved channels.

Related resources from NHI Mgmt Group

• How should organizations manage browser extension risks?
• When should enterprises review their extension policies?
• When is it appropriate to remove a browser extension?
• Who is accountable when a malicious extension or fake AI tool steals credentials from managed endpoints?