CVE•Published 2026-04-02•Modified 2026-07-24•1 article on news•5 live references•NVD data

CVE-2026-34838Intermesh · Group-office

Vulnerability data via NVD (ingested)

CVSS v3.1

9.9

CRITICAL

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

EPSS percentile

Exploit Prediction Scoring System · top 40% of all CVEs

Weaknesses (CWE)

CWE-502Deserialization of Untrusted Data

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.

Timeline

Published 2026-04-02

Modified 2026-07-24

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-34838

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Intermesh Group-office"

All exposed Intermesh Group-office instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Group-office"

HTTP body or banner mentions "Group-office" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-34838