CVE-2026-58127
PACSgear MediaWriter 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service
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.
INFO
Published Date :
July 1, 2026, 4:16 p.m.
Last Modified :
Oct. 25, 2026, 5:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Disable or remove PACSgear MediaWriter service.
- Restrict access to port 9000.
- Implement authentication for .NET Remoting services.
- Update PACSgear MediaWriter to a secure version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-58127.
| URL | Resource |
|---|---|
| https://gist.github.com/VAMorales/dc679ecab30b7045fa07bf3249a034d8 | Exploit Third Party Advisory |
| https://www.hyland.com/en/solutions/products/pacsgear | Product |
| https://www.vulncheck.com/advisories/pacsgear-mediawriter-unauthenticated-rce-via-net-remoting-tcp-service | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-58127 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-58127
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-58127 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-58127 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: PACSgear MediaWriter de Hyland, Description: PACSgear MediaWriter 5.2.1 expone un servicio TCP de .NET Remoting en el puerto 9000 a través de PacsgearMediaServerEngine.dll, registrado con los ObjectURIs RemoteObj y UIRemoteObj, sin ningún requisito de autenticación. Al explotar la técnica de desmarshalling de objetos MarshalByRefObject e implementar métodos de la clase .NET WebClient, un atacante remoto no autenticado puede leer y escribir archivos arbitrarios en el sistema de archivos del host. Los ObjectURIs son idénticos en todas las instalaciones por defecto. Encadenar la primitiva de escritura de archivos arbitrarios con oportunidades de secuestro de DLL en el servicio MediaWriter (que se ejecuta como NT Authority\\SYSTEM y carga DLLs faltantes como CRYPTBASE.DLL desde el directorio de la aplicación) permite la ejecución remota de código no autenticada como SYSTEM al reiniciar el servicio. -
Initial Analysis by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:hyland:pacsgear:*:*:*:*:*:*:*:* versions up to (including) 5.2.1 Added Reference Type VulnCheck: https://gist.github.com/VAMorales/dc679ecab30b7045fa07bf3249a034d8 Types: Exploit, Third Party Advisory Added Reference Type VulnCheck: https://www.hyland.com/en/solutions/products/pacsgear Types: Product Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/pacsgear-mediawriter-unauthenticated-rce-via-net-remoting-tcp-service Types: Third Party Advisory, VDB Entry -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-58127', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-01T16:15:03.705407Z'} -
New CVE Received by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Hyland', 'product': 'PACSgear MediaWriter', 'versions': [{'status': 'affected', 'version': '5.2.1', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-306 Added CWE CWE-502 Added Reference https://gist.github.com/VAMorales/dc679ecab30b7045fa07bf3249a034d8 Added Reference https://www.hyland.com/en/solutions/products/pacsgear Added Reference https://www.vulncheck.com/advisories/pacsgear-mediawriter-unauthenticated-rce-via-net-remoting-tcp-service