CVE-2026-34838CRITICAL 9.9EPSS p59.1%

CVE-2026-34838CVE-2026-34838

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.

Scoring

CVSS 3.19.9 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS1.03% probability of exploitation · percentile 59.1% · 2026-06-19T12:03:05Z
Published2026-04-02
Last modified2026-04-15

Underlying weaknesses· 1

CWE-502

References

  1. https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90
  2. https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12
  3. https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156
  4. https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq

1

TypeTargetConfidenceTier
WeaknessDeserialization of Untrusted Datacwe-5020%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.