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.

CrowdSec network observations suggest that most exploitation of CVE-2021-26084 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2021-26084. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.

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