How to Handle Vendor Privileged Access in Manufacturing

Manufacturing plants often depend on outside vendors to repair machines, update controllers and support industrial software. This helps keep production running. Still it also creates security challenges for you.

Vendors sometimes receive high level system rights. If this access stays uncontrolled, attackers may use it to enter plant networks. That is why companies must manage vendor privileged access carefully.

When you control identities, limit permissions and monitor vendor activity you protect critical systems while still allowing vendors to complete their maintenance work safely.

8 Ways to Handle Vendor Privileged Access in Manufacturing

Manufacturing plants work with many outside vendors. Vendors help you repair machines, update controllers and support plant systems. This help is useful but access can create risk. Vendors sometimes receive powerful system rights. If you do not control this access attackers may enter the plant network. That is why companies focus on strong vendor privileged access security.

Create Individual Identities for Every Vendor Technician

Many plants allow vendors to log in with shared accounts. This looks simple but it creates a big risk. When many people use one account you cannot see who did what. Security teams lose visibility. Experts suggest giving every vendor technician a separate identity so activity stays clear and traceable.

Clear user tracking. When every technician gets a separate identity you can see exactly who entered the system and what work the person performed. If something goes wrong your team can trace the activity fast and fix the issue.
Stop shared account misuse. Shared vendor accounts hide real users. Attackers love this situation because nobody knows who used the account. Individual identities remove this confusion and reduce insider or external abuse.
Support least privilege control. Security teams can assign access based on the exact role of that technician. This follows the least privilege rule where users receive only the permissions they actually need.
Better audit and compliance. Manufacturing companies often need audit records. Individual identities create clean logs that show login time system used and action taken. This helps during security reviews and compliance checks.
Expert suggestion from IAM teams. Security experts often advise separating admin level identities from normal user accounts. This separation reduces attack surface and prevents accidental misuse of powerful privileges.

Enforce Strong Authentication for Vendor Access

Vendor technicians often connect from outside the plant. They log in to repair machines, update software or check system issues. This remote access helps work move forward. Still weak login protection creates danger. Attackers can steal simple passwords. Then attackers may enter plant systems. So strong login checks become important in vendor access management.

Use multi step login. A password alone is weak today. Security teams ask vendors to enter a code from a phone app token or security device. This extra step stops attackers even if a password becomes stolen.
Verify the real technician. Vendors sometimes connect from different cities or countries. Strong authentication helps confirm that the real technician is entering the system and not an unknown user.
Block stolen credential attacks. Many cyber attacks start with leaked passwords. Multi step login blocks most of these attempts because the attacker still needs the second proof before access starts.
Protect plant systems and OT tools. Manufacturing machines and controllers run sensitive operations. Strong login protection helps prevent unknown users from changing these systems and reduces vendor access security risks.

Grant Privileged Access Only When Needed

Vendor technicians do not need powerful access all the time. Many plants still keep vendor accounts active for long periods. This creates risk because unused access becomes an easy path for attackers. A safer approach is to give privileged access only during real work. This step is a key part of best practices for securing third-party vendor privileged access.

Use just in time access. Vendors receive privileged rights only when a repair update or maintenance task begins. After the job finishes the access closes again. This simple step removes standing privileges that attackers often target.
Limit the level of permissions. Not every technician needs full system control. Security teams should give only the permissions required for the current task. This approach protects systems that manage vendor access to OT networks.
Reduce attack opportunities. When privileged accounts stay active for weeks or months attackers get more chances to misuse them. Time based access keeps the window short and lowers vendor access security risks.
Use approval before granting access. Some companies require a security team or plant admin to approve vendor access before the session begins. This extra check ensures the request is real and necessary.

According to David McNeely

“Best practices such as zero trust advocate least privilege, no implicit trust, and continuous verification. This means granting rights only when there’s a legitimate job or trouble ticket. The user is provisioned rights to work on a specific server constrained to only executing admin tools and commands for the job at hand with a defined expiration of those elevated rights.”

Security experts recommend least privilege. Experts at SANS Institute often advise organizations to follow the least privilege rule. This rule means users receive only the access needed for the job and nothing more.

Replace Always-On VPN Access with Controlled Access Gateways

Vendors often connect to plant systems through VPN. This method was common in the past. Still always active VPN access creates a big risk. When a VPN connects it often opens a large part of the network. If attackers steal one account they may move across systems easily. This is why companies now replace VPN with controlled gateways for safer vendor access to OT networks.

Limit network exposure. A VPN often gives wide network reach after login. A controlled access gateway allows vendors to reach only the system needed for their task. This step reduces vendor access security risks because attackers cannot roam across the network.
Verify every session. Access gateways follow a zero trust model. The system checks identity device and context before opening access to a specific application. It does not stop at entry. Zero Trust includes continuous verification during the session. The system keeps validating behavior and risk and can restrict or end access if something changes. This follows: never trust, always verify across the entire session not just at the start.
Control vendor sessions. Gateways allow security teams to watch sessions, record activity and stop a session anytime. This visibility helps teams understand what vendors do inside OT systems.
Reduce lateral movement. In many VPN setups once inside the network a user may reach many systems. Access gateways restrict movement by connecting vendors only to the approved machine or application.
Security experts recommend identity based access. The SANS report supports identity centric security and the need for stronger controls around access and sessions. It reinforces why vendor sessions should be treated as high risk and tightly controlled.

Monitor and Record Vendor Sessions

Vendors often enter plant systems to repair machines, update software or check issues. This work is normal. Still security teams must see what happens during these sessions. If activity stays hidden problems may grow fast. Monitoring and recording vendor sessions helps teams detect misuse early and reduce vendor access security risks.

Watch vendor activity in real time. Security tools allow teams to see what a vendor is doing during a live session. If a command looks unsafe the team can stop the session before damage happens.
Keep session recordings for review. Recording vendor sessions creates a clear history of actions. If a system problem appears later the team can replay the session and understand what happened.
Detect unusual behavior. Monitoring tools can alert the team when a vendor tries to access a system outside the approved task. This early warning helps prevent security incidents.
Support audits and investigations. Many manufacturing companies must show activity records during security reviews. Session logs and recordings give strong proof of who accessed the system and what actions happened.
Experts recommend full visibility. Security researchers at SANS Institute explain that monitoring privileged sessions is critical in industrial environments because vendor accounts often hold powerful system access.

Implement Approval Workflows for Vendor Access Requests

Vendors sometimes need access to plant systems for repair or maintenance. Still access should not open instantly. Security teams must first check if the request is real and necessary. Approval workflows help control this process. Every request passes through verification before access begins. This step helps reduce vendor access security risks.

Require request before access. A vendor should first send an access request for the specific system or machine. This request explains the task and time needed. The system then waits for approval before opening access.
Add manager or admin approval. Many plants ask a system owner or security admin to approve the request. This check confirms that the vendor really needs access for the current job.
Limit access time. Approval workflows often include time limits. When the approved time ends the system closes the access automatically. This prevents unused privileged accounts from staying active.
Create clear access records. Every approval step creates a record in the system. Security teams can later review who approved the request and when the vendor used the access.
Experts recommend controlled access flow. Researchers at SANS Institute explain that structured approval processes reduce misuse of privileged vendor accounts in critical environments.

Apply Network Segmentation Between IT and OT

Vendors sometimes need remote access to plant systems. Still giving open network access can create danger. IT systems and OT machines should not sit in the same network space. If attackers enter the IT side they may reach industrial controllers. That is why companies separate networks and control vendor privileged access carefully.

Create clear IT and OT zones. Plants should keep business systems and industrial controllers in different network segments. Firewalls and secure gateways control traffic between these zones. This separation protects production machines even if the IT network becomes compromised.
Allow vendors to reach only required systems. Vendors should connect only to the machine or application needed for maintenance. Segmentation blocks access to other controllers or safety systems. This approach supports modern vendor privileged access management solutions.
Stop lateral movement inside the plant network. When networks stay flat, attackers can jump from one system to another. Segmented networks isolate devices and limit communication paths. This design slows or stops attacks from spreading.
Use a secure DMZ for vendor connections. Many plants place a secure middle layer between IT and OT networks. Vendors connect to this controlled zone first. From there the system allows limited communication to specific OT devices.
Security experts support segmentation. Industrial security teams often recommend segmentation as a core protection layer. It reduces the attack surface and protects critical controllers even if another network becomes exposed.

Regularly Review and Remove Vendor Privileged Access

Vendor technicians often receive access for repair updates or system checks. Still many plants forget to remove this access after the job ends. Old accounts stay active for months. This creates hidden entry points for attackers. Regular reviews help teams find unused accounts and clean them. This practice keeps vendor privileged access under control.

Check vendor accounts on a schedule. Security teams should review vendor accounts every few weeks or months. During this review the team checks which accounts are still required and which accounts can be removed.
Remove access after the task ends. When a vendor finishes a repair or maintenance job the system should close the privileged account or disable it. This step prevents forgotten accounts from becoming a security gap.
Find inactive vendor identities. Some vendors stop working with the company but their accounts remain active. Regular access reviews help identify these inactive users and remove them quickly.
Use automated access reviews. Many modern vendor privileged access management solutions provide automated reports that show active accounts permissions and last login activity. This helps security teams clean access faster.

Key Considerations When Managing Vendor Privileged Access

Manufacturing plants work with many outside vendors. Vendors help maintain machines, update systems and support production tools. This access helps operations continue smoothly. Still it also creates security challenges. If control stays weak, attackers may use vendor accounts to enter the network. So companies must plan carefully when managing vendor privileged access.

Understand vendor roles clearly. Every vendor technician performs a different job. Some update software. Some repair controllers. Security teams should understand these roles first. Then teams can give the correct level of vendor privileged access based on the task.
Protect sensitive OT systems. Industrial controllers and monitoring systems run critical plant operations. Vendors should never receive broad access to all devices. Access must stay limited to the specific system required for the maintenance work.
Track vendor activity closely. Security teams should always monitor vendor sessions and keep activity logs. These records help detect unusual behavior and help teams investigate problems if a system issue appears later.
Use modern security tools. Many companies now use vendor privileged access management solutions to control vendor accounts. These tools help manage identities, monitor sessions and enforce security rules for vendor access.
Review vendor access regularly. Vendor access should not stay permanent. Security teams must review privileges often and remove accounts that are no longer needed. This step keeps the environment clean and reduces long term security exposure.

Securely Manage Your Vendor Privileged Access

Manufacturing plants depend on vendors for repair and system support. This access helps operations run smoothly but it also creates risk. If not controlled attackers may use vendor accounts to enter plant systems. So you need simple and strong controls to manage vendor access safely.

Unique vendor identity. Give each vendor a separate identity so you can clearly track access and activity.
Just in time access. Open access only when work starts and close it after the task ends to reduce exposure.
Session monitoring. Monitor vendor sessions to track actions and detect unusual behavior early.
Centralized access control. Use one system to manage approvals policies and visibility across IT and OT environments.
Access removal. Remove vendor access immediately after the job or contract ends to eliminate unused accounts.

Want stronger control over vendor access in your manufacturing systems. Start using smarter security tools today. Book a demo and see how you can manage vendor privileged access, protect OT systems and reduce risks.

FAQs

What security risks come with vendor privileged access?

Vendor accounts often hold powerful system rights. If attackers steal these credentials they may enter plant networks, change configurations or spread malware. Poor control increases vendor access security risks inside critical IT and OT systems.

How can manufacturers securely manage vendor access?

Manufacturers should verify vendor identity, limit privileges, monitor sessions and approve every request. Many companies also use vendor privileged access management solutions to control accounts, track activity and protect sensitive industrial systems.

How often should vendor access privileges be reviewed?

Security teams should review vendor privileged access on a regular schedule. Many experts suggest monthly or quarterly checks. Frequent reviews help remove inactive accounts, adjust permissions and reduce long term security exposure.