PT-2026-29881 · Intermesh · Group-Office

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34838

NVD

CVSS v3.1

9.9

Critical

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-34838

Affected Products

Group-Office

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-34838 · Security Note
• https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12 · Note
• https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq · Note
• https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90 · Note
• https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156 · Note