CVE-2026-34838

9.9 CRITICAL
Published: April 02, 2026 Modified: April 15, 2026
View on NVD

Description

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90
Source: security-advisories@github.com
Release Notes
https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12
Source: security-advisories@github.com
Release Notes
https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156
Source: security-advisories@github.com
Release Notes
https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq
Source: security-advisories@github.com
Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.9 / 10.0
EPSS (Exploit Probability)
0.8%
74th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

intermesh