CVE-2021-26084
CVSS v3
9.8
CRITICAL
EPSS Score
100.0 %
exploit probability, as of 2026-10-04
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2021-11-03
- Patch Due Date
- 2021-11-17
- Ransomware Use
- Known
Technical details
- Published
- 2021-08-30
- Exploit-DB
- EDB-50243
Frequently asked questions
What is 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.
Is CVE-2021-26084 actively exploited?
Yes. CVE-2021-26084 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2021-11-17.
What is the CVSS score for CVE-2021-26084?
CVE-2021-26084 has a CVSS v3 base score of 9.8 (CRITICAL severity).
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