{"id":"CVE-2026-91641","kind":"vulnerability","aliases":["CVE-2026-91641"],"related":[],"title":"Oracle Essbase: low-privileged network user 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 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 21.8.3.0.0 has a Security component flaw that lets a low-privileged user reach it over HTTP. A successful attack gives unauthorized read access to a subset of data Essbase can access.","severity":"medium","cvss":5.0,"epss":0.00224,"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":["no-essbase-21.8.3.0.0"],"how_to_check":"- Check the installed Oracle Essbase version against `21.8.3.0.0`\n- Review Oracle's Critical Patch Update advisory for the fixed release (unknown from sources)","fix":"- Apply the Oracle Essbase patch from the Critical Patch Update for the affected release (fixed version unknown from sources)","status":"open","published_at":"2026-10-20T22:21:04+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T04:29:31+00:00","updated_at":"2026-10-25T04:29:31+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:29:31Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Essbase patch from the Critical Patch Update for the affected release (fixed version unknown from sources)","reach":"network","title":"Oracle Essbase: low-privileged network user can read a subset of data","impact":"low","summary":"Oracle Essbase 21.8.3.0.0 has a Security component flaw that lets a low-privileged user reach it over HTTP. A successful attack gives unauthorized read access to a subset of data Essbase can access.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker reads a subset of Essbase-accessible data","analyst_note":"","how_to_check":"- Check the installed Oracle Essbase version against `21.8.3.0.0`\n- Review Oracle's Critical Patch Update advisory for the fixed release (unknown from sources)","needs_analyst":false,"not_affected_if":["no-essbase-21.8.3.0.0"],"who_is_affected":"Organisations running Oracle Essbase 21.8.3.0.0 with HTTP access reachable by users holding low-privileged accounts. Sources do not say which deployment settings make the flaw reachable, so exposure beyond the stated version is unknown.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000597,"input_tokens":3516,"output_tokens":491,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-91641':16A,19A '/av':138C '21.8.3.0.0':31B,76C '3.1':128C,137C '5.0':131C 'access':54B,62B,86C,118C,125C 'addit':104C 'affect':74C 'allow':80C 'attack':50B,83C,100C,109C 'base':129C 'c/c':143C 'chang':107C 'compon':35B,67C 'compromis':90C 'confidenti':132C 'cve':14A,17A 'cvss':127C,134C,136C 'data':13A,59B,126C 'easili':77C 'essbas':2A,24B,30B,60B,66C,92C,99C,124C 'essbase':21A 'exploit':78C 'flaw':36B 'give':51B 'host':27B 'http':47B,88C 'impact':103C,133C 'l/i':144C 'l/pr':140C 'l/ui':141C 'let':38B 'low':4A,41B,81C 'low-privileg':3A,40B 'may':101C 'n':146C 'n/a':145C 'n/ac':139C 'n/s':142C 'network':6A,85C 'oracl':1A,23B,29B,65C,91C,98C,123C 'oracle':20A 'oracle-essbas':22B 'privileg':5A,42B,82C 'product':105C 'reach':44B 'read':9A,53B,117C 'result':114C 'scope':106C 'score':130C 'secur':34B,68C 'self':26B 'self-host':25B 'signific':102C 'subset':11A,57B,121C 'success':49B,108C 'support':70C 'unauthor':52B,116C 'user':7A,43B 'vector':135C 'vendor':28B 'version':71C 'via':87C 'vulner':63C,79C,95C,112C","nicknames":[],"mitigations":[],"who_affected":"Organisations running Oracle Essbase 21.8.3.0.0 with HTTP access reachable by users holding low-privileged accounts. Sources do not say which deployment settings make the flaw reachable, so exposure beyond the stated version is unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:21:04+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-2026-91641","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91641","severity":null,"published_at":"2026-10-20T22:21:04+00:00","modified_at":"2026-10-23T14:57:45+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-2026-91641","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91641","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"}