CVE-2021-26084
Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
- Published
- Aug 30, 2021
- Updated
- Dec 16, 2025
- Assigning CNA
- atlassian
- Evidence observed
- Sep 1, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 100.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
38- CVE-2021-26084Exploit
CVE-2021-26084 Remote Code Execution on Confluence Servers
- CVE-2021-26084Scanner
Atlassian Confluence CVE-2021-26084 one-liner mass checker
Proof-of-concept exploit for CVE-2021-26084, an OGNL injection vulnerability in Confluence Server and Data Center, demonstrating unauthenticated remote code execution.
Responsible use
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