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. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2021-26084 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2021-26084 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

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