Is CVE-2021-26084 actively exploited?

CVE-2021-26084 has no public evidence of in-the-wild exploitation as of 2025-10-24.

What is the CVSS score for CVE-2021-26084?

CVE-2021-26084 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-26084?

Patch guidance is available from atlassian security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-26084.

Fix CVE-2021-26084 - CRITICAL

Q: Which products are affected by CVE-2021-26084?

8 products: atlassian confluence data center, atlassian confluence data center, atlassian confluence data center, atlassian confluence data center, atlassian confluence server, and 3 more.

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 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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-917 CWE-917

Metadata

Primary Vendor: ATLASSIAN
Published: 8/30/2021
Last Modified: 10/24/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

atlassian : confluence_data_centeratlassian : confluence_data_centeratlassian : confluence_data_centeratlassian : confluence_data_centeratlassian : confluence_serveratlassian : confluence_serveratlassian : confluence_serveratlassian : confluence_server

Remediation Guidance

Executive Summary

View on NIST NVD