Confluence Data Center - SQLi (CVE-2021-26084)
Description
In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.
psychologyCrowdSec Analysis
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 data shows that most actors exploiting CVE-2021-26084 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2021-26084 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2021-26084 is currently experiencing high visibility and active exploitation across the internet.
Typical exploitation attempts target endpoint patterns such as /pages/createpage-entervariables.action, /confluence/pages/createpage-entervariables.action, and similar URLs.
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| Event | Date |
|---|---|
| CVE Published | 2021-08-30 |
| CISA KEV | 2021-11-03 |
| CISA Remediation Deadline | 2021-11-17 |
| Rule Released | 2025-04-04 |
| CrowdSec First Seen | 2025-04-07 |