CVE-2026-45551
Group-Office: Authenticated Stored XSS in Administrator Context via Arbitrary Cross-User Setting Write
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 | CWE-79 CWE-639 |
| Vendor | intermesh |
| Product | groupoffice |
| Published | May 29, 2026 |
| Last Updated | May 29, 2026 |
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