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CVE-2026-34838— Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`

Quick assessment

Affected
Intermesh groupoffice
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.

Group Office是荷兰Group Office公司的一款模块化的办公套件。 Group Office 6.8.156之前版本、25.0.90之前版本和26.0.12之前版本存在代码问题漏洞，该漏洞源于AbstractSettingsCollection模型存在不安全的反序列化，可能导致任意文件写入和远程代码执行。

CVSS 10.0 · Critical EPSS 0.99% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34838

Vulnerability Information
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Vulnerability Title
Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
Source: CVE Program / CVE List V5
Vulnerability Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Group Office 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Group Office是荷兰Group Office公司的一款模块化的办公套件。 Group Office 6.8.156之前版本、25.0.90之前版本和26.0.12之前版本存在代码问题漏洞，该漏洞源于AbstractSettingsCollection模型存在不安全的反序列化，可能导致任意文件写入和远程代码执行。
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
Intermesh groupoffice < 6.8.156 -

II. Public POCs for CVE-2026-34838

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Qwen3.6-35B-A3B · 15192 chars
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III. Intelligence Information for CVE-2026-34838

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Vendor Advisories for CVE-2026-34838 (1)

IV. Related Vulnerabilities

Same product: groupoffice
Same vendor: Intermesh
Same weakness: CWE-502

V. Comments for CVE-2026-34838

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