CVE-2022-26134: Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

Vulnerability summary

CVE-2022-26134 is a critical (CVSS 9.8) vulnerability in Atlassian Confluence Server/Data Center. It is known to be exploited: CISA and ENISA list it, first on 02-06-2022. It has been used in ransomware campaigns. EPSS estimates a 100.00% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 4 public exploits are recorded.

Timeline

1. 02-06-2022
   Added to CISA KEVExploitedAtlassian Confluence Server and Data Center Remote Code Execution Vulnerability
2. 03-06-2022
   PublishedVulnerability first disclosed.
3. 06-06-2022
   CISA remediation dueDeadline passedApply mitigations per vendor instructions.
4. 21-10-2025
   Last modifiedVulnerability information updated.
5. 31-07-2026
   Added to ENISA KEVExploitedAdded to the ENISA known exploited vulnerabilities catalog.

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 from 1.3.0 before 7.4.17, from 7.13.0 before 7.13.7, from 7.14.0 before 7.14.3, from 7.15.0 before 7.15.2, from 7.16.0 before 7.16.4, from 7.17.0 before 7.17.4, and from 7.18.0 before 7.18.1.

• CWE-917Improper Neutralization of Special Elements used in an Expression Language StatementThe product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.