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CVE-2026-104805— Mitel MiVoice Office 400 Backup Restoration Arbitrary File Write Leading to Root Code Execution

Quick assessment

Affected
Mitel Mitel MiVoice Office 400
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.

DigitalCanion 发现备份恢复功能中存在一个漏洞，允许具有配置备份仓库访问权限的攻击者在恢复过程中向系统植入任意文件。 该缺陷具体存在于备份恢复机制中，该机制未能正确验证还原的 TGZ 归档文件中包含的路径、文件类型、完整性和真实性。应用程序在解压归档文件之前未执行文件签名验证，从而允许特别构造的备份文件包含攻击者可控的文件。 因此，拥有备份 SFTP 或其他配置仓库访问权限的攻击者可以提供一个恶意的 TGZ 归档文件，当系统恢复该文件时，可能会在底层 Linux 系统中放置任意文件。根据提取文件的位置和

CVSS 8.5 · High
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I. Basic Information for CVE-2026-104805

Vulnerability Information
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Vulnerability Title
Mitel MiVoice Office 400 Backup Restoration Arbitrary File Write Leading to Root Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
DigitalCanion has discovered a vulnerability in the backup restoration functionality that allows an attacker with access to the configured backup repository to introduce arbitrary files into the system during restoration. The specific flaw exists within the backup restoration mechanism, which fails to properly validate the paths, file types, integrity, and authenticity of files contained within a restored TGZ archive. The application does not perform file-signature verification before extracting the archive, allowing a specially crafted backup to contain attacker-controlled files. An attacker with access to the backup SFTP or other configured repository can therefore provide a malicious TGZ archive that, when restored by the system, may place arbitrary files on the underlying Linux system. Depending on the location and permissions of the extracted files, this behavior can potentially be leveraged to achieve arbitrary code execution with root privileges and compromise the underlying virtual machine. The absence of enforced backup passwords further reduces the protection provided by the backup mechanism and may facilitate unauthorized access to the repository.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/AU:Y/R:U/V:D/RE:M/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mitel Mitel MiVoice Office 400 11.0.96.0 -

II. Public POCs for CVE-2026-104805

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III. Intelligence Information for CVE-2026-104805

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Security Blog Posts for CVE-2026-104805 (1)

Same Patch Batch · Mitel · 2026-10-05 · 8 CVEs total

CVE-2026-104706 8.4 HIGH Mitel MiVoice Office 400 view system files path traversal
CVE-2026-104810 8.4 HIGH Mitel MiVoice Office 400 File Management File Browser path traversal vulnerability
CVE-2026-104809 8.4 HIGH Mitel MiVoice Office 400 Shared Object Hijacking Leading to Arbitrary Code Execution
CVE-2026-104811 8.4 HIGH Mitel MiVoice Office 400 Music on Hold WAV File Upload Code Execution
CVE-2026-104806 5.5 MEDIUM Mitel MiVoice Office 400 System Logs Path Traversal Information Disclosure
CVE-2026-104807 1.9 LOW Mitel MiVoice Office 400 stored Cross-Site Scripting
CVE-2026-104808 1.9 LOW Mitel MiVoice Office 400 stored Cross-Site Scripting

IV. Related Vulnerabilities

Same product: Mitel MiVoice Office 400
Same vendor: Mitel
Same weakness: CWE-22

V. Comments for CVE-2026-104805

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