Authorization bypass through user-controlled key in Group Office - #VU165942
Published: November 11, 2026
Vulnerability identifier: #VU165942
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose contact names and their containing address books across access-control boundaries.
The vulnerability exists due to authorization bypass through user-controlled keys in Group Office's files/folder/checkModelFolder endpoint when retrieving modern entities and their folder paths without enforcing record or folder permissions. A remote user can enumerate contact identifiers with access to the Files module to harvest names and address-book membership from returned paths.
Affected software
Group Office
Remediation
Install security update from vendor's website.
Group Office - update to 6.8.179