Pass-through printing is a printing mode where a client or server forwards a print job to another printer or print system without rendering it itself. The job is handed off in its original form, which can preserve printer-specific features but also means access control and routing depend on the forwarding path.
What Pass-Through Printing Is in Practice
Pass-through printing is not a rendering step, it is a forwarding step. The original print job is handed from one system to another without being interpreted or transformed first, so the downstream printer or print service remains responsible for final handling, feature support, and job execution.
This matters because the forwarding point becomes part of the trust boundary. Whatever sends the job onward can influence where it lands, how it is routed, and whether access controls are enforced consistently across the chain.
Why Pass-Through Printing Is Used
The main appeal is fidelity. When a job passes through unchanged, printer-specific capabilities such as finishing, color handling, tray selection, or device-native commands are more likely to survive intact than they would if an intermediate system re-rendered the document.
That same design can simplify compatibility in mixed environments, especially where a front-end system needs to act as a dispatcher rather than a print processor. The trade-off is that correctness depends on the forwarding relationship, not just the printer at the end of the path.
Security and Access Implications
Because the job is not normalized at the forwarding layer, the security posture depends heavily on who can submit, relay, or redirect jobs. If the path is weakly controlled, users may reach printers they should not access, or jobs may be sent through services that are not intended to see sensitive content.
Pass-through handling can also make auditability harder. When routing, authentication, and authorization are split across systems, it becomes less obvious which component enforced the decision and which component merely forwarded the job.
In hybrid print estates, the forwarding system can become a policy choke point. If its permissions, queue rules, or connector trust are loose, it may create an indirect path to devices that would otherwise be segmented or restricted.
Operational Failure Modes
Pass-through printing fails most visibly when the downstream printer does not understand the original job format or expects different capabilities than the forwarding system assumed. In those cases, the job may print incorrectly, stall, or produce incomplete output.
There is also an operational dependency on consistency between queues, drivers, and routing logic. If one link in the chain changes, the job may still be delivered, but not to the right device, with the right settings, or under the right policy conditions.
Risk and Threat Considerations
Pass-through printing can expand exposure when the forwarding path is trusted more than the destination device. A compromised or misconfigured relay can redirect jobs, expose sensitive documents in transit, or bypass intended access controls on specific printers.
Failure mechanism: The forwarding component becomes a policy and routing dependency, so weaknesses in queue permissions, connector trust, or job-handling logic can be abused to alter destination, visibility, or access.
Impact: Sensitive documents may be delivered to unintended devices or users, and the organisation may lose confidence in print-path segregation, auditability, and document handling controls.
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 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 |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-3 — Access Enforcement | Pass-through printing relies on enforcing who can submit and route jobs to printers. |
| AU-2 — Event Logging | Job forwarding creates routing and access events that should be logged for traceability. | |
| Recommendation — Enforce approved print-path access rules so relays cannot send jobs to unauthorized devices. Log print submission, forwarding, and destination changes to support investigation and accountability. | ||
| NIST CSF 2.0 | PR.AA-05 — Network Integrity and Resilience | Print forwarding depends on trusted routing paths and segmented device access. |
| Recommendation — Segment print-routing paths so forwarding systems cannot weaken device trust boundaries. | ||
| OWASP Non-Human Identity Top 10 | NHI-05 — Overprivileged NHI | Forwarding services that relay print jobs can become overprivileged routing intermediaries. |
| Recommendation — Limit relay accounts and service permissions to only the printers and queues they genuinely need. | ||
Practitioner Guidance
Why practitioners should care: Treat pass-through printing as a control-path decision, not just a convenience feature. The key question is whether the forwarding system is allowed to make routing decisions without weakening device-level access rules.
What to watch for: Review which systems can relay jobs, which printers they can reach, and whether those permissions are broader than the business need. If the forwarding layer can send to many devices, it should be governed as part of the printing trust boundary, not as a neutral transport hop.
Practitioner takeaway: The security of pass-through printing is only as strong as the weakest trusted hop in the print path.
Related resources from NHI Mgmt Group
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- When should organisations use native pass-through instead of an OpenAI-compatible adapter for voice applications?
- How should investigators handle crypto tracing when funds pass through exchanges or deposit addresses?
- What do teams get wrong when they pass tenant credentials through serverless application layers?
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Reviewed and updated by the NHIMG editorial team on November 2, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org