CVE-2026-16157 Duplicati CVE debrief

Who should care

System administrators and users of Duplicati v2.3.0.1 backup software should be aware of this vulnerability and take necessary precautions to prevent exploitation. This includes reviewing system configurations, ensuring software is updated or patched, and monitoring for suspicious activity related to the Duplicati service.

Technical summary

The Duplicati v2.3.0.1 backup software has a vulnerability that allows Authenticated Users to have MODIFY permissions that propagate to all subdirectories. This can be exploited by a standard local user to overwrite any DLL in the service directory, leading to arbitrary code execution as SYSTEM. The vulnerability arises from the software's installation outside of the Program Files directory or on a custom path, creating a LocalSystem service running from a directory that any standard local user can write to.

Defensive priority

High

Recommended defensive actions

• Apply the vendor patch or update to a fixed version
• Restrict access to the Duplicati service directory
• Monitor for suspicious activity and DLL changes
• Implement compensating controls, such as DLL whitelisting
• Review system configurations for potential exposure
• Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-07-22T18:16:55.410Z and has not been modified since then. The NVD entry is currently Deferred. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected systems and review vendor guidance for specific deployment contexts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.