# CVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability

> CVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-26084
Last updated: 2025-12-16T18:04:05Z

- Published: 2021-08-30 06:30 UTC · Updated: 2025-12-16 18:04 UTC · Assigner: atlassian
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Atlassian: Confluence Data Center
- Atlassian: Confluence Server

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-26084)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-26084)
- [http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html](http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html)
- [https://jira.atlassian.com/browse/CONFSERVER-67940](https://jira.atlassian.com/browse/CONFSERVER-67940)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-26084 · Markdown: https://rewindex.com/cve/CVE-2021-26084.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-26084 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:32.024Z