# CVE-2021-26084: Confluence Data Center - SQLi

> Live exploitation tracking for CVE-2021-26084 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2021-26084

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** Atlassian Confluence Data Center
- **Weaknesses:** CWE-917 (Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection'))
- **Tags:** enterprise_software, wiki

## 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.

## CrowdSec analysis

[CVE-2021-26084](https://euvd.enisa.europa.eu/vulnerability/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.

## Timeline

- 2021-08-30: CVE Published. CVE-2021-26084 is published to NVD.
- 2021-11-03: CISA KEV. CVE-2021-26084 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2021-11-17: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2025-04-04: Rule Released. CrowdSec releases a rule to detect CVE-2021-26084 exploitation attempts against the CrowdSec Network.
- 2025-04-07: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2021-26084 for the first time.

## References

- https://jira.atlassian.com/browse/CONFSERVER-67940
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26084.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2021-26084) follows observed exploitation activity for CVE-2021-26084. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.