{"id":"CVE-2026-63011","published":"2026-11-10T17:17:45.980","lastModified":"2026-11-10T21:19:32.157","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-94","CWE-95","CWE-184"],"vendors":[],"products":[],"references":[{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v25.0.102","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v26.0.27","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v6.8.167","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-4m9w-3p93-6cwx","tags":[]}],"exploitRefs":[{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v25.0.102","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v26.0.27","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/releases/tag/v6.8.167","tags":[]},{"url":"https://github.com/Intermesh/groupoffice/security/advisories/GHSA-4m9w-3p93-6cwx","tags":[]}],"hasPoc":true,"ai":null}