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CVE-2026-26978— Free PBX backup: Deserialization of Untrusted Data in admin/modules/backup/Models/BackupSplFileInfo.php

Quick assessment

Affected
FreePBX security-reporting
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.

FreePBX是FreePBX项目的一套通过GUI（基于网页的图形化接口）配置Asterisk（IP电话系统）的工具。 FreePBX 16.0.71之前版本和17.0.6之前版本存在代码问题漏洞，该漏洞源于备份模块在恢复操作中未正确清理数据，可能导致远程代码执行。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.97% · P61

Affected Version Matrix 2

VendorProduct Version RangeStatus
FreePBX security-reporting < 16.0.71 affected
>= 17.0.0, < 17.0.6 affected
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I. Basic Information for CVE-2026-26978

Vulnerability Information
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Vulnerability Title
Free PBX backup: Deserialization of Untrusted Data in admin/modules/backup/Models/BackupSplFileInfo.php
Source: CVE Program / CVE List V5
Vulnerability Description
FreePBX is an open source IP PBX. In versions below 16.0.71 and 17.0.6, the backup module does not properly sanitize data during restore operations, potentially leading to compromise if the backup contains carefully crafted hostile data. During backup restore operations, FreePBX extracts selected files from a user-supplied tar archive. If a malicious file exists in the archive, it is read and passed directly to unserialize() without validation, class restrictions, or integrity checks. This issue allows Remote Code Execution during restoration of the backup as the web server user (typically asterisk or www-data). The attack does not require shell access, CLI access, or filesystem write permissions beyond the normal restore workflow. Authentication with a known username that has sufficient access permissions and/or write access to backup files is required. This issue has been fixed in versions 16.0.71 and 17.0.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
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
FreePBX 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreePBX是FreePBX项目的一套通过GUI（基于网页的图形化接口）配置Asterisk（IP电话系统）的工具。 FreePBX 16.0.71之前版本和17.0.6之前版本存在代码问题漏洞，该漏洞源于备份模块在恢复操作中未正确清理数据，可能导致远程代码执行。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreePBX security-reporting < 16.0.71 -

II. Public POCs for CVE-2026-26978

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III. Intelligence Information for CVE-2026-26978

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Patches & Fixes for CVE-2026-26978 (2)

Vendor Advisories for CVE-2026-26978 (1)

IV. Related Vulnerabilities

Same product: security-reporting
Same vendor: FreePBX
Same weakness: CWE-502

V. Comments for CVE-2026-26978

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