Deserialization of Untrusted Data in Group Office - CVE-2026-34838
Published: March 31, 2026
Vulnerability identifier: #VU124704
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34838
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in the "AbstractSettingsCollection" model. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Group Office
How to mitigate CVE-2026-34838
Install updates from vendor's website.
Group Office - addressed in versions 6.8.156, 25.0.90, 26.0.12