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CVE-2026-45551— Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write

Quick assessment

Affected
Intermesh groupoffice
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.

Group Office是荷兰Group Office公司的一款模块化的办公套件。 Group Office 26.0.25之前版本、25.0.100之前版本和6.8.165之前版本存在安全漏洞，该漏洞源于允许认证用户为任意用户ID持久化遗留设置，以及邮件模块中email_font_size设置直接注入JavaScript未转义，可能导致低权限用户覆盖管理员设置并触发存储型跨站脚本。

AI Predicted 8.8 Difficulty: Moderate EPSS 0.23% · P14

Affected Version Matrix 3

VendorProduct Version RangeStatus
Intermesh groupoffice >= 26.0.1, < 26.0.25 affected
>= 25.0.1, < 25.0.1005 affected
< 6.8.165 affected
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I. Basic Information for CVE-2026-45551

Vulnerability Information
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Vulnerability Title
Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write
Source: CVE Program / CVE List V5
Vulnerability Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to 26.0.25, 25.0.100, and 6.8.165, GroupOffice allows authenticated users to persist arbitrary legacy settings for any user_id via index.php?r=core/saveSetting. A separate client-side sink in the email module injects the email_font_size setting directly into JavaScript without escaping. By combining these two issues, any low-privileged authenticated user can overwrite an administrator's email_font_size setting with a JavaScript payload and trigger stored XSS in the administrator's browser when the GroupOffice web client loads views/Extjs3/modulescripts.php. This vulnerability is fixed in 26.0.25, 25.0.100, and 6.8.165.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Group Office 安全漏洞
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 26.0.25之前版本、25.0.100之前版本和6.8.165之前版本存在安全漏洞，该漏洞源于允许认证用户为任意用户ID持久化遗留设置，以及邮件模块中email_font_size设置直接注入JavaScript未转义，可能导致低权限用户覆盖管理员设置并触发存储型跨站脚本。
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
Intermesh groupoffice >= 26.0.1, < 26.0.25 -

II. Public POCs for CVE-2026-45551

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III. Intelligence Information for CVE-2026-45551

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Vendor Advisories for CVE-2026-45551 (1)

IV. Related Vulnerabilities

Same product: groupoffice
Same vendor: Intermesh
Same weakness: CWE-79

V. Comments for CVE-2026-45551

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