CVE Vulnerabilities

CVE-2021-26084

Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Published: Aug 30, 2021 | Modified: Aug 08, 2023
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
Ubuntu

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.

Weakness

The 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.

Affected Software

Name Vendor Start Version End Version
Confluence_data_center Atlassian * 6.13.23 (excluding)
Confluence_data_center Atlassian 6.14.0 (including) 7.4.11 (excluding)
Confluence_data_center Atlassian 7.5.0 (including) 7.11.6 (excluding)
Confluence_data_center Atlassian 7.12.0 (including) 7.12.5 (excluding)
Confluence_server Atlassian * 6.13.23 (excluding)
Confluence_server Atlassian 6.14.0 (including) 7.4.11 (excluding)
Confluence_server Atlassian 7.5.0 (including) 7.11.6 (excluding)
Confluence_server Atlassian 7.12.0 (including) 7.12.5 (excluding)

Potential Mitigations

  • If user-controlled data must be added to an expression interpreter, one or more of the following should be performed:

References