Executive brief
Intermesh Group-Office is an enterprise CRM and groupware suite used for managing business communications and customer data. A security flaw allows a standard user to modify the settings of other users, including administrators. By changing an administrator's email font settings to include malicious code, an attacker can take over the administrator's account when they log in, potentially leading to full system compromise and unauthorized access to sensitive company data.
Technical details
A vulnerability exists in Group-Office due to an authorization bypass in the 'core/saveSetting' controller (CWE-639), which fails to verify if the authenticated user has permission to modify the 'user_id' parameter. An attacker can use this to overwrite the 'email_font_size' setting for an administrator. A secondary vulnerability (CWE-79) in the email module's 'scripts.inc.php' fails to escape this setting before injecting it into a JavaScript string literal in 'modulescripts.php'. By chaining these, a low-privileged user can inject a malicious payload that executes in the administrator's browser context, leading to session hijacking and full privilege escalation. The issue is fixed in versions 26.0.25, 25.0.100, and 6.8.165.
Affected products
- Intermesh Group-Office < 26.0.25, < 25.0.100, < 6.8.165
Timeline
- 2026-04-14: other: Vulnerability validated by researcher
- 2026-05-11: advisory: Vendor advisory published via GitHub
- 2026-05-29: disclosed: CVE published to NVD