Intermesh Group-Office up to 6.8.166/25.0.101/26.0.26 Contact/labels JMAP Endpoint TemplateParser::parse tpl os command injection

Summaryinfo

A vulnerability classified as critical was found in Intermesh Group-Office up to 6.8.166/25.0.101/26.0.26. This issue affects the function TemplateParser::parse of the component Contact/labels JMAP Endpoint. Executing a manipulation of the argument tpl can lead to os command injection. This vulnerability appears as CVE-2026-63011. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Intermesh Group-Office up to 6.8.166/25.0.101/26.0.26. It has been declared as critical. This vulnerability affects the function TemplateParser::parse of the component Contact/labels JMAP Endpoint. The manipulation of the argument tpl with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.167, 25.0.102, and 26.0.27, the Contact/labels JMAP endpoint in GroupOffice accepts a fully attacker-controlled template string (tpl parameter) that is passed without restriction to TemplateParser::parse(). When the template contains an [assign] block whose expression includes a {{...}} variable reference, the engine calls eval() on the expanded expression after running it through a validateExpression() guard. The guard double-quotes unrecognized tokens, but PHP 7+ allows a string enclosed in parentheses to be invoked as a function ("system")("id") is valid PHP and calls system("id"). A single authenticated HTTP request is sufficient to execute arbitrary OS commands as the web server user (www-data). This issue has been patched in versions 6.8.167, 25.0.102, and 26.0.27.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-63011 since 07/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 6.8.167, 25.0.102 or 26.0.27 eliminates this vulnerability.

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Productinfo

Vendor

• Intermesh

Name

• Group-Office

Version

• 6.8.166
• 25.0.101
• 26.0.0
• 26.0.1
• 26.0.2
• 26.0.3
• 26.0.4
• 26.0.5
• 26.0.6
• 26.0.7
• 26.0.8
• 26.0.9
• 26.0.10
• 26.0.11
• 26.0.12
• 26.0.13
• 26.0.14
• 26.0.15
• 26.0.16
• 26.0.17
• 26.0.18
• 26.0.19
• 26.0.20
• 26.0.21
• 26.0.22
• 26.0.23
• 26.0.24
• 26.0.25
• 26.0.26

CPE 2.3info

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CPE 2.2info

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