CVE-2026-63011
GroupOffice Vulnerable to RCE in TemplateParser eval() via Contact/labels
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| groupoffice Intermesh |
< 6.8.167 (affected) < 25.0.102 (affected) < 26.0.27 (affected) |
CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 9.4 critical |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/Intermesh/groupoffice/security/advisories/GHSA-4m9w-3p93-6cwxCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/Intermesh/groupoffice/releases/tag/v25.0.102CNA: GitHub_M · x_refsource_MISC
- https://github.com/Intermesh/groupoffice/releases/tag/v26.0.27CNA: GitHub_M · x_refsource_MISC
- https://github.com/Intermesh/groupoffice/releases/tag/v6.8.167CNA: GitHub_M · x_refsource_MISC
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