CVE-2026-34838

CRITICAL EPSS 59.3%
Published Apr 2, 20262mo ago · Modified Jun 17, 20262w ago
9.9 CVSS 3.1
Critical
Find Similar
Published Apr 2, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.9
Exploitability
3.1
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
59.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-502 Deserialization of Untrusted Data Validation

Affected Products 3

VendorProductVersionRange
intermeshgroup-office* <6.8.156
intermeshgroup-office*≥25.0.1  –  <25.0.90
intermeshgroup-office*≥26.0.1  –  <26.0.12

References 4

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.