{"id":"CVE-2021-26084","aliases":["EUVD-2021-12905","GHSA-855c-xp53-5fp2"],"status":"published","title":"In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists...","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.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.99999,"percentile":0.99993,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-74","CWE-917"],"published":"2021-08-30T06:30:14Z","modified":"2026-06-17T03:42:49Z","kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"exploits":[{"source":"metasploit","id":"exploit/multi/http/atlassian_confluence_webwork_ognl_injection","title":"Atlassian Confluence WebWork OGNL Injection","type":"exploit","platform":"Linux,Unix,Windows","date":"2021-08-25","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/multi/http/atlassian_confluence_webwork_ognl_injection"},{"source":"pocgithub","id":"alt3kx/CVE-2021-26084_PoC","title":"alt3kx/CVE-2021-26084_PoC","date":"2021-08-31","url":"https://github.com/alt3kx/CVE-2021-26084_PoC"},{"source":"pocgithub","id":"crowsec-edtech/CVE-2021-26084","title":"crowsec-edtech/CVE-2021-26084","date":"2021-08-31","url":"https://github.com/crowsec-edtech/CVE-2021-26084"},{"source":"pocgithub","id":"0xf4n9x/CVE-2021-26084","title":"0xf4n9x/CVE-2021-26084","date":"2021-09-01","url":"https://github.com/0xf4n9x/CVE-2021-26084"},{"source":"pocgithub","id":"CrackerCat/CVE-2021-26084","title":"CrackerCat/CVE-2021-26084","date":"2021-09-01","url":"https://github.com/CrackerCat/CVE-2021-26084"},{"source":"exploitdb","id":"EDB-50243","title":"Confluence Server 7.12.4 - 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Remote Code Execution","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26084.yaml"}],"exploits_more":10,"products":[{"vendor":"atlassian","product":"confluence data center"},{"vendor":"atlassian","product":"confluence server"},{"vendor":"atlassian","product":"confluence server and data center"},{"vendor":"atlassian","product":"confluence_data_center"},{"vendor":"atlassian","product":"confluence_server"}],"references":[{"url":"https://jira.atlassian.com/browse/CONFSERVER-67940","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26084"},{"url":"http://packetstormsecurity.com/files/164013/Confluence-Server-7.12.4-OGNL-Injection-Remote-Code-Execution.html"},{"url":"http://packetstormsecurity.com/files/164122/Atlassian-Confluence-WebWork-OGNL-Injection.html"},{"url":"https://github.com/advisories/GHSA-855c-xp53-5fp2"}],"sources":{"cve":[{"id":"CVE-2021-26084","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.","status":"published","published":"2021-08-30T06:30:14.248Z","modified":"2025-12-16T18:04:05.834Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-917"],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-12905","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.","status":"published","published":"2021-08-30T06:30:14Z","modified":"2025-12-16T18:04:05Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T19:49:04.646122Z"}],"ghsa":[{"id":"GHSA-855c-xp53-5fp2","title":"In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists...","description":"In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an authenticated user, and in some instances an unauthenticated user, to execute arbitrary code on a Confluence Server or Data Center instance. The vulnerable endpoints can be accessed by a non-administrator user or unauthenticated user if ‘Allow people to sign up to create their account’ is enabled. To check whether this is enabled go to COG \u003e User Management \u003e User Signup Options. 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.","status":"published","published":"2022-05-24T22:28:25Z","modified":"2025-10-22T00:32:19Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-74","CWE-917"],"updated_at":"2026-11-02T15:04:05.344883Z"}],"kev":[{"id":"CVE-2021-26084","title":"Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability","description":"Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.","cwes":["CWE-917"],"kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"updated_at":"2026-11-02T17:00:17.050017Z"}],"nvd":[{"id":"CVE-2021-26084","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.","status":"published","published":"2021-08-30T07:15:06.587Z","modified":"2026-06-17T03:42:49.75Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-917"],"updated_at":"2026-11-02T14:06:57.67549Z"}]}}