{"schema":"threatline.record/2","record":{"id":"CVE-2026-21589","aliases":[],"summary":"Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability","details":"Multiple Atlassian products (Bitbucket Data Center ,Confluence Data Center, Jira Service Management Data Center, Jira Software Data Center, Bamboo Data Center, Crowd Data Center, Crucible and Fisheye) contain a files or directories accessible to external parties vulnerability which could allow an unauthenticated attacker to access specific files within the web application root directory in affected versions.","categories":["Unclassified"],"product":"Multiple Products","vendor":"Atlassian","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Bamboo Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 10.2.24 and later"},{"status":"unaffected","version":"Patch version 12.1.12 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Bitbucket Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 10.2.8 and later"},{"status":"unaffected","version":"Patch version 10.5.1 and later"},{"status":"unaffected","version":"Patch version 9.4.26 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Confluence Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 10.2.19 and later"},{"status":"unaffected","version":"Patch version 9.2.26 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Crowd Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 7.2.4 and later"},{"status":"unaffected","version":"Patch version 7.1.7 and later"},{"status":"unaffected","version":"Patch version 7.0.3 and later"},{"status":"unaffected","version":"Patch version 6.3.7 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Crucible Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 4.9.15 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Fisheye Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 4.9.15 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Jira Service Management Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 11.3.12 and later"},{"status":"unaffected","version":"Patch version 10.3.26 and later"},{"status":"unaffected","version":"Patch version 5.12.40 and later"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","source_modified_at":"2026-10-19T18:26:40.891Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Jira Software Data Center","vendor":"Atlassian","versions":[{"status":"affected","version":"All other versions"},{"status":"unaffected","version":"Patch version 11.3.12 and later"},{"status":"unaffected","version":"Patch version 10.3.26 and later"},{"status":"unaffected","version":"Patch version 9.12.40 and later"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":true,"date_added":"2026-10-15","due_date":"2026-10-18","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","ransomware_campaign_use":"Unknown","forensic_triage":true},"epss":{"probability":0.12711,"percentile":0.96263,"score_date":"2026-10-23"},"published_at":"2026-10-05T21:30:00.390Z","modified_at":"2026-10-19T18:26:40.891Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-21589","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-19T18:26:40.891Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-21589","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Nuclei","EPSS"],"references":[{"url":"https://confluence.atlassian.com/security/cve-2026-21589-arbitrary-file-access-vulnerability-impacts-multiple-products-1870495748.html?ref=labs.watchtowr.com","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21589","source":"CISA KEV"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/BAM-26567"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/BSERV-20604"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/CONFSERVER-104488"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/CRUC-8741"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/CWD-6610"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/FE-7583"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/JRASERVER-79546"},{"source":"CVE List","url":"https://jira.atlassian.com/browse/JSDSERVER-16809"},{"source":"CVE List","url":"https://github.com/watchtowrlabs/watchTowr-vs-Atlassian-CVE-2026-21589","tags":["exploit"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21589","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2026-10-15T00:00:00+00:00"},"exploits":[{"kind":"Scanner template","name":"Atlassian Jira/Confluence/Bitbucket - Pre-Auth Arbitrary File Read","source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21589.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-19T18:26:40.891Z","content_hash":"50fa495a3377f45e70cba09e20ba33536d7bc39509e03d0d7eaf808811bfe95d"}}