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
- Oct 19, 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
confluence/CVE-2021-26084
Atlassian Confluence Webwork Pre-Auth OGNL Injection Leads to RCE (CVE-2021-26084)
Vulhub vulnerability labsDeclared conditions
- lab image version: vulhub/confluence:7.4.10(confluence/CVE-2021-26084/docker-compose.yml:services.web.image)
- lab image version: postgres:12.8-alpine(confluence/CVE-2021-26084/docker-compose.yml:services.db.image)
modules/exploits/multi/http/atlassian_confluence_webwork_ognl_injection.rb
Metasploit Framework modulesDeclared conditions
- platform: Linux,Unix,Windows($.exploit_multi/http/atlassian_confluence_webwork_ognl_injection.platform)
- verification: check_declared($.exploit_multi/http/atlassian_confluence_webwork_ognl_injection.check)
http/cves/2021/CVE-2021-26084.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: status,word($.matchers[*].type)
Responsible use
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