{"id":"CVE-2026-115710","kind":"vulnerability","aliases":["CVE-2026-115710"],"related":[],"title":"Elasticsearch: shared query cache leaks hidden field matches between users","description":"Use of Cache Containing Sensitive Information (CWE-524) in Elasticsearch can lead to information disclosure and incorrect search results via specially crafted search requests. For some query types, Elasticsearch can share cached query results between users who have field-level security restrictions and users who do not. A user restricted by field-level security can learn which documents match a value in a field that they cannot read. A restricted user can also cause users with full access to receive incomplete search results. Disclosure is only possible when a user with full access ran the same query on the same shard recently.","summary":"Elasticsearch can share cached query results between users with field-level security and users without it, for some query types. A restricted user can learn which documents match a value in a field they cannot read, and can cause full-access users to receive incomplete search results.","severity":"medium","cvss":4.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["elasticsearch","field-level-security","package","self-hosted"],"not_affected_if":["no-field-level-security","single-user-cluster"],"how_to_check":null,"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":"2026-11-03T17:24:43+00:00","updated_at":"2026-11-03T17:24:43+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-03T17:24:43Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Elasticsearch: shared query cache leaks hidden field matches between users","impact":"low","summary":"Elasticsearch can share cached query results between users with field-level security and users without it, for some query types. A restricted user can learn which documents match a value in a field they cannot read, and can cause full-access users to receive incomplete search results.","audience":"businesses","category":"package","nicknames":[],"who_cares":["elasticsearch","field-level-security","self-hosted"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"restricted users learn hidden field values and full-access users get wrong results","analyst_note":"Check the Elastic advisory for affected and fixed versions and the list of query types affected; sources given only the NVD entry.","how_to_check":"- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["no-field-level-security","single-user-cluster"],"who_is_affected":"Affects Elasticsearch clusters that use field-level security for some users while other users run the same queries on the same shard. Disclosure requires a full-access user to have run the same query on that shard recently. Clusters without field-level security restrictions are not described as exposed.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"unknown"},"cost_usd":0.000651,"input_tokens":4203,"output_tokens":461,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-115710':13A,16A '-2026':12A,15A '-524':82C 'access':68B,154C,169C 'also':149C 'cach':4A,29B,77C,106C 'cannot':61B,143C 'caus':65B,150C 'contain':78C 'craft':96C 'cve':11A,14A 'cwe':81C 'disclosur':89C,160C 'document':53B,134C 'elasticsearch':1A,17B,26B,84C,103C 'field':7A,19B,36B,59B,114C,128C,140C 'field-level':35B,113C,127C 'field-level-secur':18B 'full':67B,153C,168C 'full-access':66B 'hidden':6A 'host':25B 'incomplet':72B,157C 'incorrect':91C 'inform':80C,88C 'lead':86C 'leak':5A 'learn':51B,132C 'level':20B,37B,115C,129C 'match':8A,54B,135C 'packag':22B 'possibl':163C 'queri':3A,30B,45B,101C,107C,173C 'ran':170C 'read':62B,144C 'receiv':71B,156C 'recent':178C 'request':98C 'restrict':48B,117C,125C,146C 'result':31B,74B,93C,108C,159C 'search':73B,92C,97C,158C 'secur':21B,38B,116C,130C 'self':24B 'self-host':23B 'sensit':79C 'shard':177C 'share':2A,28B,105C 'special':95C 'type':46B,102C 'use':75C 'user':10A,33B,40B,49B,69B,110C,119C,124C,147C,151C,166C 'valu':56B,137C 'via':94C 'without':41B","nicknames":[],"mitigations":[],"who_affected":"Affects Elasticsearch clusters that use field-level security for some users while other users run the same queries on the same shard. Disclosure requires a full-access user to have run the same query on that shard recently. Clusters without field-level security restrictions are not described as exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["elasticsearch","fieldlevelsecurity","medium","package","selfhosted"],"first_public_at":"2026-11-03T17:17:55+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","cvss_by":"security@elastic.co","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-115710","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115710","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"}