{"cveID":"CVE-2021-26084","vendorProject":"Atlassian","product":"Confluence Server and Data Center","vulnerabilityName":"Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability","dateAdded":"2021-11-03","shortDescription":"Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-26084","cwes":["CWE-917"],"year":2021,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2021-26084","technique":"T1059","technique_name_at_mapping":"Command and Scripting Interpreter","mapping_type":"primary_impact","capability_group":"inject","comments":"CVE-2021-26084 is a critical vulnerability affecting Atlassian Confluence Server and Data Center that allows unauthenticated remote code execution. This Object-Graph Navigation Language (OGNL) injection vulnerability enables attackers to execute arbitrary code on vulnerable Confluence instances","references":["https://thehackernews.com/2021/09/atlassian-confluence-rce-flaw-abused-in.html","https://www.bleepingcomputer.com/news/security/atlassian-confluence-flaw-actively-exploited-to-install-cryptominers/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2021-26084","technique":"T1496","technique_name_at_mapping":"Resource Hijacking","mapping_type":"secondary_impact","capability_group":"inject","comments":"CVE-2021-26084 is a critical vulnerability affecting Atlassian Confluence Server and Data Center that allows unauthenticated remote code execution. This Object-Graph Navigation Language (OGNL) injection vulnerability enables attackers to execute arbitrary code on vulnerable Confluence instances","references":["https://thehackernews.com/2021/09/atlassian-confluence-rce-flaw-abused-in.html","https://www.bleepingcomputer.com/news/security/atlassian-confluence-flaw-actively-exploited-to-install-cryptominers/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1059","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Command and Scripting Interpreter","name_at_mapping":"Command and Scripting Interpreter","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":95,"has_detection_strategy":true},{"id":"T1496","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Resource Hijacking","name_at_mapping":"Resource Hijacking","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":13,"has_detection_strategy":true}],"mapping_types":["primary_impact","secondary_impact"],"has_exploitation_technique":false,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":["245f92e3-c4da-45f1-9070-bc552e06db11","38825179-3c78-4fed-b222-2e2166b926b1","583aa0a2-30b1-4d62-8bf3-ab73689efe6c"],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}