{"cve":{"cve_id":"CVE-2021-26086","is_kev":true,"kev_date_added":"2024-11-12","kev_vendor_project":"Atlassian","kev_product":"Jira Server and Data Center","kev_vulnerability_name":"Atlassian Jira Server and Data Center Path Traversal Vulnerability","kev_short_description":"Atlassian Jira Server and Data Center contain a path traversal vulnerability that allows a remote attacker to read particular files in the /WEB-INF/web.xml endpoint.","kev_required_action":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","kev_due_date":"2024-12-03","kev_known_ransomware":false,"kev_notes":"https://jira.atlassian.com/browse/JRASERVER-72695 ; https://nvd.nist.gov/vuln/detail/CVE-2021-26086","kev_cwes":["CWE-22"],"epss_score":0.99999,"epss_percentile":0.99991,"epss_as_of":"2026-06-23","description":"Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.","published_at":"2021-08-16T00:15:09.827000Z","last_modified_at":null,"cvss_v3_score":5.3,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"active","ssvc_automatable":true,"ssvc_technical_impact":"partial","cwes":["CWE-22"],"nvd_references":["https://jira.atlassian.com/browse/JRASERVER-72695","http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html"],"vuln_status":null,"trending_score":0.6099982,"is_trending":true,"has_trended":true,"trended_number_one":false,"trending_peak_score":0.6099982,"trending_peak_rank":46,"started_trending_at":"2026-06-29T02:30:27.366045Z","trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-29T02:30:27.550645Z"},"effective_severity":"MEDIUM","badges":["kev","poc","trending","epss"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-data-center","product_name":"Jira Data Center","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.16.1","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-data-center:unspecified:8.16.1"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-data-center","product_name":"Jira Data Center","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.5.14","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-data-center:unspecified:8.5.14"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-data-center","product_name":"Jira Data Center","version_start":"8.6.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-data-center:8.6.0:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-data-center","product_name":"Jira Data Center","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.13.6","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-data-center:unspecified:8.13.6"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-data-center","product_name":"Jira Data Center","version_start":"8.14.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-data-center:8.14.0:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-server","product_name":"Jira Server","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.5.14","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-server:unspecified:8.5.14"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-server","product_name":"Jira Server","version_start":"8.6.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-server:8.6.0:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-server","product_name":"Jira Server","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.13.6","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-server:unspecified:8.13.6"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-server","product_name":"Jira Server","version_start":"8.14.0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-server:8.14.0:unspecified"},{"vendor_slug":"atlassian","vendor_name":"Atlassian","product_slug":"jira-server","product_name":"Jira Server","version_start":"unspecified","version_start_inclusive":true,"version_end":"8.16.1","version_end_inclusive":false,"cpe23_uri":"cve5:atlassian:jira-server:unspecified:8.16.1"}],"exploit_refs":[{"source":"nuclei","kind":"nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26086.yaml","title":"Atlassian Jira Limited - Local File Inclusion","author":"cocxanh","disclosed_at":null}],"news":[],"references":[{"url":"https://jira.atlassian.com/browse/JRASERVER-72695","source_type":"MISC","tags":[]},{"url":"http://packetstormsecurity.com/files/164405/Atlassian-Jira-Server-Data-Center-8.4.0-File-Read.html","source_type":"EXPLOIT","tags":["exploit"]}],"timeline":[{"type":"published","at":"2021-08-16T00:15:09.827000Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2024-11-12T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"poc_available","at":"2026-06-24T00:29:48.638073Z","label":"Public PoC available","source":"nuclei"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:38.771468Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:38.771468Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"started_trending","at":"2026-06-29T02:30:27.366045Z","label":"Started trending","source":null}]}