Vulnerability Intelligence Report
Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
CVE-2021-26084
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.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:100.00%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-917 ↗CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Atlassian | Confluence Server | unspecified < 6.13.23 (affected), 6.14.0 < unspecified (affected), unspecified < 7.4.11 (affected), 7.5.0 < unspecified (affected), unspecified < 7.11.6 (affected), 7.12.0 < unspecified (affected), unspecified < 7.12.5 (affected) |
| Atlassian | Confluence Data Center | unspecified < 6.13.23 (affected), 6.14.0 < unspecified (affected), unspecified < 7.4.11 (affected), 7.5.0 < unspecified (affected), unspecified < 7.11.6 (affected), 7.12.0 < unspecified (affected), unspecified < 7.12.5 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
99.999%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Atlassian · Vendor · Australia |
| Reserved | 2021-01-25T00:00:00 |
| Published | 2021-08-30T06:30:14 |
| Patch Date | 2021-08-10 |
| Last Updated | 2025-12-16T18:04:05 |
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