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CVE-2026-26221— Hyland OnBase Timer Service Unauthenticated .NET Remoting RCE

Quick assessment

Affected
Hyland OnBase Workflow Timer Service
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hyland Software Hyland OnBase是美国Hyland Software公司的一款用于展示企业信息管理、流程的平台。 Hyland Software Hyland OnBase存在安全漏洞，该漏洞源于OnBase Workflow Timer Service存在未经身份验证的.NET Remoting暴露，可能导致发送特制.NET Remoting请求触发不安全的对象反序列化，从而实现任意文件读写，进而导致远程代码执行。

CVSS 9.8 · Critical EPSS 1.62% · P76

Affected Version Matrix 1

VendorProduct Version RangeStatus
Hyland OnBase Workflow Timer Service 8.0≤ 17.0.0 affected
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I. Basic Information for CVE-2026-26221

Vulnerability Information
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Vulnerability Title
Hyland OnBase Timer Service Unauthenticated .NET Remoting RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Hyland OnBase contains an unauthenticated .NET Remoting exposure in the OnBase Workflow Timer Service (Hyland.Core.Workflow.NTService.exe). An attacker who can reach the service can send crafted .NET Remoting requests to default HTTP channel endpoints on TCP/8900 (e.g., TimerServiceAPI.rem and TimerServiceEvents.rem for Workflow) to trigger unsafe object unmarshalling, enabling arbitrary file read/write. By writing attacker-controlled content into web-accessible locations or chaining with other OnBase features, this can lead to remote code execution. The same primitive can be abused by supplying a UNC path to coerce outbound NTLM authentication (SMB coercion) to an attacker-controlled host.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Hyland Software Hyland OnBase 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hyland Software Hyland OnBase是美国Hyland Software公司的一款用于展示企业信息管理、流程的平台。 Hyland Software Hyland OnBase存在安全漏洞，该漏洞源于OnBase Workflow Timer Service存在未经身份验证的.NET Remoting暴露，可能导致发送特制.NET Remoting请求触发不安全的对象反序列化，从而实现任意文件读写，进而导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Hyland OnBase Workflow Timer Service 8.0 ~ 17.0.0 -

II. Public POCs for CVE-2026-26221

# POC Description Source Link Shenlong Link
1 None https://github.com/mbanyamer/CVE-2026-26221-Hyland-OnBase-Timer-Service-Unauthenticated-RCE POC Details
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III. Intelligence Information for CVE-2026-26221

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Other References for CVE-2026-26221 (1)

IV. Related Vulnerabilities

Same vendor: Hyland
Same weakness: CWE-502

V. Comments for CVE-2026-26221

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