CVE-2026-25134Public exploitNetwork attack vector

Authenticated command execution via zip argument injection

Published Feb 2, 2026 · Updated Feb 2, 2026

Argument injection in GroupOffice before 6.8.150, 25.0.82, and 26.0.5 allows remote authenticated users to execute server commands. MaintenanceController::actionZipLanguage derives a temporary filename from the lang parameter, concatenates it into a zip command, and passes the resulting string to exec() without neutralizing argument delimiters. Basic user access and a crafted ZIP upload are required; injected zip test-command options can locate and execute the uploaded payload despite its randomized temporary path.

CVSS severity9.4
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in GroupOffice before 6.8.150, 25.0.82, and 26.0.5 allows remote authenticated users to execute server commands. MaintenanceController::actionZipLanguage derives a temporary filename from the lang parameter, concatenates it into a zip command, and passes the resulting string to exec() without neutralizing argument delimiters. Basic user access and a crafted ZIP upload are required; injected zip test-command options can locate and execute the uploaded payload despite its randomized temporary path.

The record

CVE
CVE-2026-25134
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
Intermesh BV
Product
GroupOffice
Classifications
CWE-88, CWE-434, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 25.0.0, < 25.0.82
  2. Affected versionversion=>= 26.0.0, < 26.0.5
  3. Affected versionversion=< 6.8.150

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Intermesh BV · GroupOfficeversion=>= 25.0.0, < 25.0.82; version=>= 26.0.0, < 26.0.5; version=< 6.8.150

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.4GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWE-434Unrestricted Upload of File with Dangerous Type
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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