CVE-2026-45551: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Intermesh groupoffice
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.
AI Analysis
Technical Summary
GroupOffice versions before 26.0.25, 25.0.100, and 6.8.165 contain a stored XSS vulnerability due to improper neutralization of input during web page generation (CWE-79). Authenticated users can exploit a flaw in the core/saveSetting endpoint to overwrite arbitrary user settings, including those of administrators. The email module then injects the email_font_size setting directly into JavaScript without escaping, allowing a malicious payload to execute in the administrator's browser when loading views/Extjs3/modulescripts.php. This vulnerability is addressed in the fixed versions mentioned.
Potential Impact
An attacker with low-level authenticated access can execute arbitrary JavaScript in the context of an administrator's browser session. This can lead to session hijacking, privilege escalation, or other actions performed with the administrator's privileges within the GroupOffice web client. The CVSS 4.0 base score is 5.1, indicating a medium severity impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available and has been released in GroupOffice versions 26.0.25, 25.0.100, and 6.8.165. Since this is a cloud service, the vendor manages remediation for the hosted environment. Users should ensure they are running these patched versions or verify with the vendor that the cloud service has been updated accordingly.
CVE-2026-45551: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Intermesh groupoffice
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.
CVSS v4.0
Score 5.1medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GroupOffice versions before 26.0.25, 25.0.100, and 6.8.165 contain a stored XSS vulnerability due to improper neutralization of input during web page generation (CWE-79). Authenticated users can exploit a flaw in the core/saveSetting endpoint to overwrite arbitrary user settings, including those of administrators. The email module then injects the email_font_size setting directly into JavaScript without escaping, allowing a malicious payload to execute in the administrator's browser when loading views/Extjs3/modulescripts.php. This vulnerability is addressed in the fixed versions mentioned.
Potential Impact
An attacker with low-level authenticated access can execute arbitrary JavaScript in the context of an administrator's browser session. This can lead to session hijacking, privilege escalation, or other actions performed with the administrator's privileges within the GroupOffice web client. The CVSS 4.0 base score is 5.1, indicating a medium severity impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available and has been released in GroupOffice versions 26.0.25, 25.0.100, and 6.8.165. Since this is a cloud service, the vendor manages remediation for the hosted environment. Users should ensure they are running these patched versions or verify with the vendor that the cloud service has been updated accordingly.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-12T17:48:47.880Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
Threat ID: 6a198b23e29bf47b50e58de7
Added to database: 5/29/2026, 12:48:35 PM
Last enriched: 5/29/2026, 1:04:15 PM
Last updated: 5/29/2026, 8:18:47 PM
Views: 6
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