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CVE-2026-34838

Intermesh Group-office remote code execution

9.9 CRITICALEPSS 0.99%
  1. Published2 Apr 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Intermesh Group-office≥ 25.0.1 < 25.0.90 · ≥ 26.0.1 < 26.0.12 · < 6.8.156

Remediation

Fixed in
Intermesh Group-office≥ 25.0.90

References

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Frequently asked

Is CVE-2026-34838 being actively exploited?

CVE-2026-34838 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.99%.

How severe is CVE-2026-34838?

CVE-2026-34838 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.99% probability of exploitation.

Which products are affected by CVE-2026-34838?

Affected products include Intermesh Group-office.

How do I fix CVE-2026-34838?

Upgrade affected software to a fixed version, for example Intermesh Group-office 25.0.90 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34838 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.