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CVE-2026-34838

CRITICAL

9.9

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.

CVE Details

CVSS v3.1 Score9.9

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published4/2/2026

Last Modified4/3/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-502

References

https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90(security-advisories@github.com)

https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12(security-advisories@github.com)

https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156(security-advisories@github.com)

https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq(security-advisories@github.com)

IOC Correlations

No correlations recorded

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