{"id":"CVE-2026-91631","kind":"vulnerability","aliases":["CVE-2026-91631"],"related":[],"title":"Oracle Essbase: low-privilege network attacker reads 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 low privileged attacker with network access via HTTP to compromise Oracle Essbase.  While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change).  Successful attacks of this vulnerability can result in  unauthorized read access to a subset of Oracle Essbase accessible data. CVSS 3.1 Base Score 5.0 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N).","summary":"Oracle Essbase's Security component has a flaw that lets a low-privileged user reach data over HTTP that they should not see. The sources report unauthorized read access to a subset of Essbase data, with a scope change that may extend impact to other products.","severity":"medium","cvss":5.0,"epss":0.00295,"exploited":false,"exploited_at":null,"products":[{"name":"oracle essbase","fixed":[],"affected":"= 21.8.3.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["enterprise","oracle-essbase","self-hosted","vendor"],"not_affected_if":["no-essbase-deployment"],"how_to_check":"- Confirm the deployed Essbase version with the Oracle admin console or install records; the sources list `21.8.3.0.0` as affected\n- Check Oracle's Critical Patch Update advisory for the Essbase patch level unknown","fix":"- Apply the Oracle security update for Essbase listed in the Oracle advisory; the fixed version is unknown from the sources\n- Restrict HTTP access to Essbase to trusted networks until patched","status":"open","published_at":"2026-10-20T22:21:03+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T04:30:39+00:00","updated_at":"2026-10-25T04:30:39+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:30:39Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle security update for Essbase listed in the Oracle advisory; the fixed version is unknown from the sources\n- Restrict HTTP access to Essbase to trusted networks until patched","reach":"network","title":"Oracle Essbase: low-privilege network attacker reads a subset of data","impact":"low","summary":"Oracle Essbase's Security component has a flaw that lets a low-privileged user reach data over HTTP that they should not see. The sources report unauthorized read access to a subset of Essbase data, with a scope change that may extend impact to other products.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted","enterprise"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker reads a subset of Essbase data, possibly affecting other products","analyst_note":"Find the fixed Essbase version and the exact HTTP endpoint in the Oracle Security Alert or CPU advisory for CVE-2026-91631.","how_to_check":"- Confirm the deployed Essbase version with the Oracle admin console or install records; the sources list `21.8.3.0.0` as affected\n- Check Oracle's Critical Patch Update advisory for the Essbase patch level unknown","needs_analyst":true,"not_affected_if":["no-essbase-deployment"],"who_is_affected":"Teams running Oracle Essbase version 21.8.3.0.0 that accept HTTP connections from users holding low-privilege accounts. The sources do not describe a configuration that avoids the flaw, so treat any deployment with network-reachable low-privilege users as in scope.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000653,"input_tokens":3516,"output_tokens":602,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-91631':15A,18A '/av':151C '21.8.3.0.0':89C '3.1':141C,150C '5.0':144C 'access':58B,99C,131C,138C 'addit':117C 'affect':87C 'allow':93C 'attack':7A,96C,113C,122C 'base':142C 'c/c':156C 'chang':68B,120C 'compon':33B,80C 'compromis':103C 'confidenti':145C 'cve':13A,16A 'cvss':140C,147C,149C 'data':12A,45B,64B,139C 'easili':90C 'enterpris':21B 'essbas':2A,24B,30B,63B,79C,105C,112C,137C 'essbase':20A 'exploit':91C 'extend':71B 'flaw':36B 'host':27B 'http':47B,101C 'impact':72B,116C,146C 'l/i':157C 'l/pr':153C 'l/ui':154C 'let':38B 'low':4A,41B,94C 'low-privileg':3A,40B 'may':70B,114C 'n':159C 'n/a':158C 'n/ac':152C 'n/s':155C 'network':6A,98C 'oracl':1A,23B,29B,78C,104C,111C,136C 'oracle':19A 'oracle-essbas':22B 'privileg':5A,42B,95C 'product':75B,118C 'reach':44B 'read':8A,57B,130C 'report':55B 'result':127C 'scope':67B,119C 'score':143C 'secur':32B,81C 'see':52B 'self':26B 'self-host':25B 'signific':115C 'sourc':54B 'subset':10A,61B,134C 'success':121C 'support':83C 'unauthor':56B,129C 'user':43B 'vector':148C 'vendor':28B 'version':84C 'via':100C 'vulner':76C,92C,108C,125C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase version 21.8.3.0.0 that accept HTTP connections from users holding low-privilege accounts. The sources do not describe a configuration that avoids the flaw, so treat any deployment with network-reachable low-privilege users as in scope.","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:L/UI:N/S:C/C:L/I:N/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91631","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91631","severity":null,"published_at":"2026-10-20T22:21:03+00:00","modified_at":"2026-10-23T17:19:41+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-2026-91631","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91631","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"}