Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`

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Summary

CVECVE-2026-34838
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 20:16:28 UTC
Updated2026-04-02 20:16:28 UTC
DescriptionGroup-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.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED10CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Intermesh Groupoffice affected < 6.8.156 Not specified
CNA Intermesh Groupoffice affected < 25.0.90 Not specified
CNA Intermesh Groupoffice affected < 26.0.12 Not specified

References

ReferenceSourceLinkTags
github.com/Intermesh/groupoffice/releases/tag/v26.0.12 [email protected] github.com
github.com/Intermesh/groupoffice/releases/tag/v6.8.156 [email protected] github.com
github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq [email protected] github.com
github.com/Intermesh/groupoffice/releases/tag/v25.0.90 [email protected] github.com
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