{"id":"CVE-2026-115298","kind":"vulnerability","aliases":["CVE-2026-115298"],"related":[],"title":"Elasticsearch: field-level security gap lets users read a restricted field","description":"Incorrect Authorization (CWE-863) in Elasticsearch can lead to information disclosure via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). An authenticated user whose index access is restricted by field-level security can retrieve the value of a constant_keyword field that their role excludes. Some search and query features do not apply the field-level security restriction to this field type.","summary":"Elasticsearch search and query features skip field-level security for constant_keyword fields. An authenticated user whose role excludes such a field can still read its value.","severity":"medium","cvss":4.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["elasticsearch","infrastructure","search","self-hosted"],"not_affected_if":["auth-required","no-field-level-security"],"how_to_check":"- Check the Elasticsearch version with `GET /` and compare it against the fixed versions in the product ranges (unknown in the sources).\n- Find indices that use `constant_keyword` fields together with field-level security roles.","fix":null,"status":"open","published_at":"2026-11-03T17:17:55+00:00","first_seen_at":"2026-11-03T17:21:55+00:00","triaged_at":"2026-11-03T17:24:36+00:00","updated_at":"2026-11-03T17:24:36+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-11-03T17:24:36Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Elasticsearch: field-level security gap lets users read a restricted field","impact":"low","summary":"Elasticsearch search and query features skip field-level security for constant_keyword fields. An authenticated user whose role excludes such a field can still read its value.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["elasticsearch","self-hosted","search"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"authenticated user reads a hidden constant_keyword field value","analyst_note":"Find the affected version ranges and fixed releases in the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-115298 or Elastic's advisory.","how_to_check":"- Check the Elasticsearch version with `GET /` and compare it against the fixed versions in the product ranges (unknown in the sources).\n- Find indices that use `constant_keyword` fields together with field-level security roles.","plain_action":"","needs_analyst":true,"not_affected_if":["no-field-level-security","auth-required"],"who_is_affected":"Only deployments that use field-level security to hide a constant_keyword field from some users are exposed, and the user needs a valid account. Clusters without field-level security restrictions on such fields are not affected by this flaw. The sources do not list the affected version ranges.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000677,"input_tokens":4161,"output_tokens":521,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-1':73C '-115298':15A,18A '-2026':14A,17A '-863':56C 'access':65C,79C 'acl':71C 'appli':107C 'authent':40B,75C 'author':54C 'capec':72C 'constant':36B,93C 'constrain':69C 'cve':13A,16A 'cwe':55C 'disclosur':63C 'elasticsearch':1A,19B,25B,58C 'exclud':44B,99C 'featur':29B,104C 'field':3A,12A,32B,38B,47B,84C,95C,110C,116C 'field-level':2A,31B,83C,109C 'function':66C 'gap':6A 'host':24B 'incorrect':53C 'index':78C 'inform':62C 'infrastructur':20B 'keyword':37B,94C 'lead':60C 'let':7A 'level':4A,33B,85C,111C 'proper':68C 'queri':28B,103C 'read':9A,50B 'restrict':11A,81C,113C 'retriev':88C 'role':43B,98C 'search':21B,26B,101C 'secur':5A,34B,86C,112C 'self':23B 'self-host':22B 'skip':30B 'still':49B 'type':117C 'user':8A,41B,76C 'valu':52B,90C 'via':64C 'whose':42B,77C","nicknames":[],"mitigations":[],"who_affected":"Only deployments that use field-level security to hide a constant_keyword field from some users are exposed, and the user needs a valid account. Clusters without field-level security restrictions on such fields are not affected by this flaw. The sources do not list the affected version ranges.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["elasticsearch","infrastructure","medium","search","selfhosted"],"first_public_at":"2026-11-03T17:17:55+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvss_by":"security@elastic.co","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-115298","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115298","severity":null,"published_at":"2026-11-03T17:17:55+00:00","modified_at":"2026-11-03T17:17:55+00:00","first_seen_at":"2026-11-03T17:21:55+00:00","fetched_at":"2026-11-03T17:21:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}