Intermesh groupoffice up to 6.8.149/25.0.81/26.0.4 Zip File ziplanguage lang argument injection

Summaryinfo

A vulnerability has been found in Intermesh groupoffice up to 6.8.149/25.0.81/26.0.4 and classified as critical. Impacted is the function ziplanguage of the component Zip File Handler. This manipulation of the argument lang causes argument injection. This vulnerability appears as CVE-2026-25134. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Intermesh groupoffice up to 6.8.149/25.0.81/26.0.4. It has been declared as critical. Affected by this vulnerability is the function ziplanguage of the component Zip File Handler. The manipulation of the argument lang with an unknown input leads to a argument injection vulnerability. The CWE definition for the vulnerability is CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Group-Office is an enterprise customer relationship management and groupware tool. Prior to 6.8.150, 25.0.82, and 26.0.5, the MaintenanceController exposes an action zipLanguage which takes a lang parameter and passes it directly to a system zip command via exec(). This can be combined with uploading a crafted zip file to achieve remote code execution. This vulnerability is fixed in 6.8.150, 25.0.82, and 26.0.5.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-25134 since 01/29/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 6.8.150, 25.0.82 or 26.0.5 eliminates this vulnerability. Applying the patch d28490a6a29936db7888aa841ab8ade88800540b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Intermesh

Name

• groupoffice

Version

• 6.8.149
• 25.0.0
• 25.0.1
• 25.0.2
• 25.0.3
• 25.0.4
• 25.0.5
• 25.0.6
• 25.0.7
• 25.0.8
• 25.0.9
• 25.0.10
• 25.0.11
• 25.0.12
• 25.0.13
• 25.0.14
• 25.0.15
• 25.0.16
• 25.0.17
• 25.0.18
• 25.0.19
• 25.0.20
• 25.0.21
• 25.0.22
• 25.0.23
• 25.0.24
• 25.0.25
• 25.0.26
• 25.0.27
• 25.0.28
• 25.0.29
• 25.0.30
• 25.0.31
• 25.0.32
• 25.0.33
• 25.0.34
• 25.0.35
• 25.0.36
• 25.0.37
• 25.0.38
• 25.0.39
• 25.0.40
• 25.0.41
• 25.0.42
• 25.0.43
• 25.0.44
• 25.0.45
• 25.0.46
• 25.0.47
• 25.0.48
• 25.0.49
• 25.0.50
• 25.0.51
• 25.0.52
• 25.0.53
• 25.0.54
• 25.0.55
• 25.0.56
• 25.0.57
• 25.0.58
• 25.0.59
• 25.0.60
• 25.0.61
• 25.0.62
• 25.0.63
• 25.0.64
• 25.0.65
• 25.0.66
• 25.0.67
• 25.0.68
• 25.0.69
• 25.0.70
• 25.0.71
• 25.0.72
• 25.0.73
• 25.0.74
• 25.0.75
• 25.0.76
• 25.0.77
• 25.0.78
• 25.0.79
• 25.0.80
• 25.0.81
• 26.0.0
• 26.0.1
• 26.0.2
• 26.0.3
• 26.0.4

License

• open-source

Website

• Product: https://github.com/Intermesh/groupoffice/

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