{"cve":"CVE-2021-26084","nvd":{"published":"2021-08-30T07:15:06.587","modified":"2026-06-17T03:42:49.750","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-917"],"references":["http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html","https://jira.atlassian.com/browse/CONFSERVER-67940","http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html","https://jira.atlassian.com/browse/CONFSERVER-67940","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084"],"products":["atlassian:confluence_data_center","atlassian:confluence_server"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-26084","score":0.99999,"percentile":0.99993,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-26084","date_added":"2021-11-03","due_date":"2021-11-17","vendor":"Atlassian","product":"Confluence Server and Data Center","known_ransomware":true},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}