{"id":"CVE-2026-91634","kind":"vulnerability","aliases":["CVE-2026-91634"],"related":[],"title":"Oracle Essbase: unauthenticated network attacker can read a subset of data","description":"Vulnerability in Oracle Essbase (component: Security).   The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle Essbase.  Successful attacks of this vulnerability can result in  unauthorized read access to a subset of Oracle Essbase accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).","summary":"Oracle Essbase version 21.8.3.0.0 has a Security component flaw reachable over T3 and IIOP. An unauthenticated attacker with network access can read a subset of data Essbase can access.","severity":"medium","cvss":5.3,"epss":0.00251,"exploited":false,"exploited_at":null,"products":[{"name":"oracle essbase","fixed":[],"affected":"= 21.8.3.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["oracle-essbase","self-hosted","vendor"],"not_affected_if":["unknown"],"how_to_check":"- Confirm the installed Essbase version against `21.8.3.0.0` in the Oracle Essbase deployment or admin console.\n- Check whether T3 or IIOP listeners are reachable from untrusted networks; the sources do not name a config file or setting.","fix":"- Apply the Oracle Critical Patch Update for Essbase that addresses this CVE; the fixed version is unknown from the sources.","status":"open","published_at":"2026-10-20T22:21:03+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T04:22:28+00:00","updated_at":"2026-10-25T04:22:28+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:22:28Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Critical Patch Update for Essbase that addresses this CVE; the fixed version is unknown from the sources.","reach":"network","title":"Oracle Essbase: unauthenticated network attacker can read a subset of data","impact":"low","summary":"Oracle Essbase version 21.8.3.0.0 has a Security component flaw reachable over T3 and IIOP. An unauthenticated attacker with network access can read a subset of data Essbase can access.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker reads a subset of data Essbase can access","analyst_note":"Find the fixed Essbase version and the Oracle CPU advisory for CVE-2026-91634 at the NVD link in the sources.","how_to_check":"- Confirm the installed Essbase version against `21.8.3.0.0` in the Oracle Essbase deployment or admin console.\n- Check whether T3 or IIOP listeners are reachable from untrusted networks; the sources do not name a config file or setting.","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Deployments running Oracle Essbase 21.8.3.0.0 with the T3 or IIOP protocol reachable over the network are in scope. Installations where those ports are only reachable from trusted hosts have a smaller exposure; the sources do not say more.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000622,"input_tokens":3485,"output_tokens":547,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-91634':14A,17A '/av':116C '21.8.3.0.0':30B,69C '3.1':106C,115C '5.3':109C 'access':46B,55B,78C,96C,103C 'affect':67C 'allow':73C 'attack':5A,43B,75C,87C 'base':107C 'compon':34B,60C 'compromis':83C 'confidenti':110C 'cve':12A,15A 'cvss':105C,112C,114C 'data':11A,52B,104C 'easili':70C 'essbas':2A,22B,28B,53B,59C,85C,102C 'essbase':19A 'exploit':71C 'flaw':35B 'host':25B 'iiop':40B,81C 'impact':111C 'l/i':122C 'l/pr':118C 'n':124C 'n/a':123C 'n/ac':117C 'n/s':120C 'n/ui':119C 'network':4A,45B,77C 'oracl':1A,21B,27B,58C,84C,101C 'oracle':18A 'oracle-essbas':20B 'reachabl':36B 'read':7A,48B,95C 'result':92C 'score':108C 'secur':33B,61C 'self':24B 'self-host':23B 'subset':9A,50B,99C 'success':86C 'support':63C 't3':38B,80C 'u/c':121C 'unauthent':3A,42B,74C 'unauthor':94C 'vector':113C 'vendor':26B 'version':29B,64C 'via':79C 'vulner':56C,72C,90C","nicknames":[],"mitigations":[],"who_affected":"Deployments running Oracle Essbase 21.8.3.0.0 with the T3 or IIOP protocol reachable over the network are in scope. Installations where those ports are only reachable from trusted hosts have a smaller exposure; the sources do not say more.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:21:03+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91634","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91634","severity":null,"published_at":"2026-10-20T22:21:03+00:00","modified_at":"2026-10-23T17:19:33+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-91634","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91634","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:55+00:00","fetched_at":"2026-10-24T13:15:55+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"}