CVE-2011-4559: SQL injection vulnerability in the Calendar module in vTiger CRM 5.2.1 and earlier allows remote attackers...

Security readout for executives and security teams

This CVE affects legacy vTiger CRM systems. A flaw in the Calendar module can let a remote attacker manipulate database queries through a request parameter. For a CRM, that raises concern for customer, sales, and operational data exposure if an old instance remains reachable. Exposure is most likely in legacy vTiger CRM 5.2.1 or earlier deployments, especially internet-facing CRM portals with the Calendar module enabled. The bundle’s affected-product metadata is sparse, but the CVE description and references consistently identify vTiger CRM 5.2.x. Prioritize any internet-facing legacy vTiger CRM instance for immediate review. If confirmed vulnerable, isolate and remediate quickly because successful SQL injection against CRM can affect sensitive customer and business data. Mitigation focus: Inventory vTiger CRM instances and identify any version 5.2.1 or earlier.; Remove public exposure for affected legacy CRM systems until remediated.; Check current vTiger guidance for the appropriate fixed version or patch..

Prepared

Jun 27, 2026, 17:48 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.