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9.3
CVE-2026-58127: PACSgear MediaWriter 5.2.1 allows unauthenticated file access and code execution
CVE-2026-58127
Summary
PACSgear MediaWriter 5.2.1 has a security flaw that allows an attacker to access and modify files on the computer without a password. This can lead to the attacker being able to run malicious code on the computer with full system privileges. To protect your system, update to the latest version of PACSgear MediaWriter or take steps to restrict access to the affected service.
Original title
PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requi...
Original description
PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requirement. By exploiting the MarshalByRefObject object unmarshalling technique and implementing .NET WebClient class methods, an unauthenticated remote attacker can read and write arbitrary files on the host filesystem. The ObjectURIs are identical across all installations by default. Chaining the arbitrary file write primitive with DLL hijacking opportunities in the MediaWriter service (which runs as NT Authority\\SYSTEM and loads missing DLLs such as CRYPTBASE.DLL from the application directory) enables unauthenticated remote code execution as SYSTEM upon service restart.
nvd CVSS3.1
9.8
nvd CVSS4.0
9.3
Vulnerability type
CWE-306
Missing Authentication for Critical Function
CWE-502
Deserialization of Untrusted Data
Published: 1 Jul 2026 · Updated: 23 Jul 2026 · First seen: 1 Jul 2026