CVE-2026-3483810.0CriticalCWE-502

CVE-2026-34838: Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`

Intermesh · groupoffice

Affected: Intermesh groupoffice · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.0%probability of exploitation in the next 30 days

64th percentile

050100

Higher than 64% of scored CVEs

10.0CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Intermesh · groupoffice< 6.8.156; < 25.0.90; < 26.0.12

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Deserialization of Untrusted Data · Deserialization and Object Injection
Vendor: Intermesh
Published: April 2026
Band: Possible (1 to 10%), April 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-34838 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.