Esri security advisory (AV26-1088)
Serial number: AV26-1088 Date: October 27, 2026 As of October 26, 2026, Esri is affected by vulnerabilities in the following product: ArcGIS Server Prior to 12.1 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. October 2026 ArcGIS Security Bulletin Esri Security Advisories
Summary from Canadian Centre for Cyber Security.