Confluence Data Center - SQLi (CVE-2021-26084)

CVE-2021-26084 is a critical OGNL injection vulnerability impacting Confluence Server and Data Center, enabling unauthenticated remote code execution by attackers through crafted requests to specific endpoints.

CrowdSec has been tracking this vulnerability and its exploits since 4th of April 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2021-26084 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. CrowdSec network telemetry also shows that exploitation of CVE-2021-26084 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Typical exploitation attempts target endpoint patterns such as /pages/createpage-entervariables.action, /confluence/pages/createpage-entervariables.action, and similar URLs.