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CVE-2026-0856

Quick assessment

Affected
Mesalvo Meona Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component都是Mesalvo公司的产品。Mesalvo Meona Client Launcher Component是一个面向医疗信息系统客户端启动与应用接入的组件。Mesalvo Meona Server Component是一个面向医院临床工作流与患者数据管理的服务端组件。 Mesalvo Meona Client Launcher Component 19.06.202

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 6

VendorProduct Version RangeStatus
Mesalvo Meona Client 2024.10 affected
2025.04 affected
2026.03 affected
Mesalvo Meona Server 2024.10 affected
2025.04 affected
2026.03 affected
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I. Basic Information for CVE-2026-0856

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Access Control vulnerability in Mesalvo MEONA (MEONA Client and MEONA Server) allows an authenticated MEONA user to access administrative functions of the MEONA Client (admin panel). The MEONA Server does not independently verify the role asserted by the MEONA Client. A user who holds a valid MEONA user account and is able to execute a modified copy of the MEONA Client on a device within the operating hospital's network can assert an administrator role and access administrative functions with regular user credentials. Exploitation requires: (1) a valid MEONA user account issued by the operating hospital; (2) network access to the MEONA Server, which is operated exclusively within closed hospital networks without exposure to the public Internet (where a hospital permits remote access to that network at all, it is only through the hospital's own remote-access infrastructure (e.g. VPN) under the hospital's control); (3) the ability to modify MEONA Client binaries and to execute the modified copy on a device in that network. On managed devices with application control, as recommended in Mesalvo's hardening guidance (MSA-2026-001), this requires local administrator privileges on the device. Mesalvo is not aware of any exploitation outside the reported security test. This issue affects MEONA Client and MEONA Server in versions 2024.10, 2025.04 and 2026.03. Mitigations are available with MEONA 2025.04.24 and 2026.03.02 (planned Q4 2026); see Mesalvo Security Advisory MSA-2026-001.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component都是Mesalvo公司的产品。Mesalvo Meona Client Launcher Component是一个面向医疗信息系统客户端启动与应用接入的组件。Mesalvo Meona Server Component是一个面向医院临床工作流与患者数据管理的服务端组件。 Mesalvo Meona Client Launcher Component 19.06.202
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mesalvo Meona Client 2024.10 -
Mesalvo Meona Server 2024.10 -

II. Public POCs for CVE-2026-0856

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III. Intelligence Information for CVE-2026-0856

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Security Blog Posts for CVE-2026-0856 (1)

Other References for CVE-2026-0856 (1)

Same Patch Batch · Mesalvo · 2026-05-20 · 4 CVEs total

CVE-2026-22314 7.9 HIGH Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component 代码注入漏洞
CVE-2026-0857 4.4 MEDIUM Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component 安全漏洞
CVE-2026-25602 2.3 LOW Mesalvo Meona Client Launcher Component和Mesalvo Meona Server Component 数据伪造问题漏洞

IV. Related Vulnerabilities

Same product: Meona Client
Same vendor: Mesalvo
Same weakness: CWE-284

V. Comments for CVE-2026-0856

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