Manufacturing PAM use cases: securing IT, OT, vendors and secrets

At a glance

What this is: This is an analysis of why privileged access management is central to manufacturing security, with a focus on IT, OT, vendor, endpoint, and machine access.

Why it matters: It matters because manufacturing teams have to govern human and non-human privileged access without interrupting production, and weak access discipline can become a plant outage.

By the numbers:

• Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.
• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.
• 79% of organisations have experienced secrets leaks, with 77% of these incidents resulting in tangible damage.

👉 Read Securden's guide on manufacturing PAM use cases and privileged access controls

Context

Manufacturing PAM is about controlling privileged access across systems where uptime, safety, and production continuity matter as much as confidentiality. The article’s core point is that shared credentials, standing vendor access, local admin rights, and hardcoded secrets create an operational risk that traditional IT-only access models do not contain well enough, especially in OT and legacy environments.

That matters for NHI governance as well as human access management. In manufacturing, the same production path may involve engineers, suppliers, automation tools, service accounts, and machine-to-machine workflows, so access control has to cover the full identity lifecycle, not just employee logins. The problem is not merely who can authenticate, but who can act with elevated privilege inside production-critical systems.

Key questions

Q: What breaks when teams rely on shared accounts for privileged access?

A: Shared accounts break accountability first. When several people use the same login, audit logs cannot reliably prove who performed a change, which slows investigations and weakens deterrence. They also break revocation, because removing one person means rotating the shared secret for everyone, which often delays remediation and extends exposure.

Q: Why do privileged access controls matter more in manufacturing than in standard IT?

A: Manufacturing environments tie identity directly to uptime, safety, and supply continuity. A privileged compromise can halt a line, interrupt shipments, or force manual recovery, so the control objective is not just data protection. Teams need access scoping, session visibility, and rapid revocation because production systems tolerate far less unmanaged privilege than office applications.

Q: How can security teams govern machine credentials in plant automation?

A: They should treat service accounts, tokens, certificates, and API keys as governed identities with ownership, expiry, rotation, and revocation rules. The key is to move them out of scripts and shared folders, then monitor usage so automation can keep running without creating silent standing access across production systems.

Q: Who is accountable for vendor access failures in manufacturing?

A: Accountability should sit with the organisation that granted the access and owns the systems being accessed, even when a vendor is the user. If third-party access is not inventoried, approved, and reviewed, the failure is a governance failure, not just a vendor issue. Manufacturing teams should map accountability to each access path and review it as part of privileged access governance.

Technical breakdown

Why privileged access in OT behaves differently from standard IT

Operational technology environments are built for availability and determinism, not frequent identity challenges. ICS, SCADA, PLCs, HMIs, and engineering workstations often depend on long-lived privileges because plant tasks are sensitive to delay, and many systems were never designed around modern IAM patterns. That creates a structural mismatch: access is needed quickly, but persistent privileges and shared accounts make accountability and containment weak. In manufacturing, one compromised privileged path can affect not just data but production flow, safety, and downstream supply commitments.

Practical implication: Treat OT privileged access as a separate governance domain with tighter task scoping, stronger monitoring, and explicit emergency access boundaries.

How vendor and OEM access becomes a third-party identity risk

Vendor access is often justified as temporary support for maintenance, troubleshooting, or firmware changes, but the technical problem is persistence. When remote access remains active after the task ends, or when vendors share credentials across jobs, the manufacturer inherits an unmanaged trust relationship. Time-bound access, hidden credentials, and session recording reduce that exposure because they shift the control point from static password ownership to governed, auditable usage. The risk is not the vendor role itself, but the lifecycle gap between approval and deprovisioning.

Practical implication: Move every third-party session into approved, time-limited workflows with recorded activity and automatic access expiry.

Why machine-to-machine secrets need PAM-style control

Automation in manufacturing depends on API keys, certificates, tokens, and service account credentials that rarely receive the same oversight as human access. Hardcoded or shared secrets are dangerous because they are difficult to rotate, hard to inventory, and easy to reuse across scripts or pipelines. Once exposed, they can provide silent access to production-connected systems without triggering normal user-based reviews. PAM for non-human identities is therefore a governance layer for secrets, rotation, and usage control, not just a vault around passwords.

Practical implication: Inventory and rotate machine credentials with the same rigor you apply to human privileged accounts, especially where automation touches production systems.

Threat narrative

Attacker objective: The objective is to turn privileged access into operational disruption by reaching systems that can stop production, delay recovery, or force manual fallback.

1. Entry begins when attackers exploit weak third-party access, exposed secrets, or an endpoint with local administrator rights to reach production-connected systems. Escalation follows when shared credentials, standing privileges, or hardcoded secrets let them move from a single foothold into broader IT or OT access. Impact occurs when that access is used to interrupt operations, alter industrial processes, encrypt systems, or force shutdowns that stop production and shipments.

Breaches seen in the wild

• IOS app secrets leakage report — iOS apps leaking hardcoded secrets and credentials endangering user privacy.
• MongoBleed breach — MongoBleed exposed secrets across 87K MongoDB servers.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Manufacturing PAM is really about production continuity governance, not just privileged account control. The article is right to frame plant access as an operational risk because manufacturing environments fail differently from office IT. When access reaches OT, engineering workstations, or vendor maintenance channels, the business impact is measured in downtime, safety exposure, and supply disruption. Practitioners should therefore evaluate PAM by whether it reduces production blast radius, not only by whether it satisfies audit language.

Shared credentials and standing access create an accountability gap that PAM exists to close. In manufacturing, accountability breaks down when multiple engineers, contractors, or automation tools can act through the same privileged path. That problem is more severe than simple password reuse because it destroys session attribution, makes recertification weaker, and complicates incident reconstruction. The practitioner takeaway is that identity provenance must be preserved across human, vendor, and machine usage, or privileged activity becomes functionally anonymous.

Vendor access without lifecycle offboarding is a standing trust debt. The article’s third-party scenarios show that the real failure mode is not vendor access itself, but the assumption that temporary access will be cleaned up later. That assumption fails when access survives maintenance windows, which means access review processes are already too late by the time they see the privilege. Practitioners should treat every vendor entitlement as a lifecycle object with a hard expiry and an enforced revocation path.

Machine credentials in manufacturing are NHI assets, and they need the same governance model as privileged humans. Scripts, APIs, certificates, and service accounts now sit on the production path just as often as engineers do. If those identities are hidden in code, shared across teams, or left unrotated, they become a durable intrusion path into OT and automation layers. The implication is that NHI inventory, rotation, and offboarding must be part of manufacturing PAM design from day one.

Named concept: privileged production blast radius. In manufacturing, the blast radius of a compromised privilege is not limited to a single system or dataset. It extends to production uptime, supplier commitments, and manual recovery effort, which makes privilege scope the decisive control variable. That is why manufacturing security teams should measure privileged access by how much operational disruption a single compromised identity could cause.

From our research:

• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface, according to Ultimate Guide to NHIs.
• 71% of NHIs are not rotated within recommended time frames, increasing the risk of compromise over time.
• Use 52 NHI Breaches Analysis to connect these privilege and rotation failures to real breach patterns.

What this signals

Privileged production blast radius: manufacturing teams should stop measuring PAM only by credential protection and start measuring how much operational disruption a single privilege could create. That shift aligns identity governance with the real failure mode in plant environments, where access can stop output as quickly as malware can encrypt files.

With 92% of organisations exposing NHIs to third parties, per the Ultimate Guide to NHIs, manufacturing vendors and automation partners cannot be treated as a secondary access tier. The practical response is to fold supplier, service account, and machine identities into the same governance lifecycle as human admins.

Manufacturing security programmes that still separate PAM, endpoint privilege management, and secrets governance are missing the operational link between them. Once production systems depend on automation and third-party support, the control plane has to cover approval, expiry, rotation, and session evidence as one joined-up process.

For practitioners

• Separate OT and IT privilege governance Classify ICS, SCADA, engineering workstation, and corporate admin access into different approval and monitoring paths so production systems are not governed like standard office endpoints.
• Time-box all vendor and OEM access Require approved windows, hidden credentials, and automatic expiry for every contractor or supplier session, including emergency support paths.
• Remove standing local admin rights from plant endpoints Use policy-based elevation for engineering workstations and operator terminals so users can run approved tasks without carrying permanent administrative privilege.
• Treat service accounts as production identities Inventory API keys, certificates, and automation secrets, then rotate and revoke them through a governed lifecycle rather than leaving them embedded in scripts or pipelines.
• Record every privileged session that can affect production Capture command-level or session-level evidence for admins, vendors, and automation support paths so incident response can reconstruct actions without relying on fragmented logs.

Key takeaways

• Manufacturing privilege failures are operational failures, because access can halt production as quickly as any other plant disruption.
• Shared credentials, standing vendor access, and machine secrets create the same governance problem across IT, OT, and automation paths.
• The decisive control is not just vaulting credentials, but enforcing expiry, attribution, and session visibility across every production-relevant identity.

Key terms

• PAM — Privileged Access Management: Solutions that control, monitor, and audit privileged access for both human and non-human identities. Traditional PAM tools are being extended to cover machine identities, service accounts, and agentic AI workloads.
• Standing Privilege: Standing privilege is access that remains active even when no immediate task requires it. For NHI programmes, it is a common failure mode because long-lived credentials and persistent roles create unnecessary exposure. Reducing standing privilege usually means tighter expiry, on-demand access, and clearer review of who or what still needs access.
• Non-Human Identity (NHI): A digital identity assigned to a non-human entity such as a software application, service account, API key, bot, machine, or AI agent that enables it to authenticate and interact with systems without direct human involvement. NHIs now outnumber human identities in most enterprises by 25 to 50 times.
• Blast Radius: The potential scope of damage if a specific credential or identity is compromised. Identities with broad permissions have a larger blast radius and represent a higher priority for least-privilege enforcement and security controls.

What's in the full article

Securden's full article covers the operational detail this post intentionally leaves for the source:

• Use-case mapping for ICS, SCADA, endpoint, vendor, and automation access in manufacturing plants.
• Practical examples of how privilege controls apply to vendor maintenance, workstation elevation, and service account management.
• A deployment-oriented view of PAM functions such as session recording, approval workflows, and audit reporting.
• How the manufacturing-specific use cases connect to compliance and production continuity requirements.

👉 The full Securden article maps PAM controls to vendor access, OT systems, endpoints, and automation workflows.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.