CVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.
Other sources
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Atlassian Confluence Server and Data Centerto a version that resolves this vulnerability.Fixed in 6.13.23 - Upgrade
Upgrade
Atlassian Confluence Server and Data Centerto a version that resolves this vulnerability.Fixed in 7.4.11 - Upgrade
Upgrade
Atlassian Confluence Server and Data Centerto a version that resolves this vulnerability.Fixed in 7.11.6 - Upgrade
Upgrade
Atlassian Confluence Server and Data Centerto a version that resolves this vulnerability.Fixed in 7.12.5
Event History
Frequently Asked Questions
What is CVE-2021-26084?
CVE-2021-26084 is a vulnerability in Atlassian Confluence Server and Data Center that allows an unauthenticated attacker to execute arbitrary code.
How severe is CVE-2021-26084?
CVE-2021-26084 has a severity score of 9.8, which is considered critical.
Which versions of Confluence Server and Data Center are affected by CVE-2021-26084?
Versions before 6.13.23 and from 6.14.0 to 7.4.11 of Confluence Server and Data Center are affected by CVE-2021-26084.
How can an attacker exploit CVE-2021-26084?
An attacker can exploit CVE-2021-26084 by injecting malicious Object-Graph Navigation Language (OGNL) code.
Is there a fix for CVE-2021-26084?
Yes, updating Confluence Server and Data Center to version 7.4.11 or later will fix the vulnerability.