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.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-184",
"CWE-94",
"CWE-95"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63011.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "6.8.167"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
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{
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},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
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{
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],
"source": "AFFECTED_FIELD",
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},
{
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"range": [
{
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}
],
"source": "REFERENCES_TAG"
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{
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],
"source": "REFERENCES_TAG"
},
{
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"range": [
{
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}
],
"source": "REFERENCES_TAG"
}
]
}