CVE-2026-45551

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.

• CWE-79
• CWE-639

• https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p
• https://github.com/Intermesh/groupoffice/security/advisories/GHSA-9w92-p32g-g99p

Published

May 29, 2026

Last Modified

Jul 21, 2026

Status

Deferred

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