{"id":"CVE-2026-91563","kind":"vulnerability","aliases":["CVE-2026-91563"],"related":[],"title":"Oracle Database OLAP: low-privilege user with DBMS_AW can take over","description":"Vulnerability in the Oracle OLAP component of Oracle Database Server.  Supported versions that are affected are 19.3-19.32, 21.3-21.23 and  23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having DBMS_AW privilege with network access via Oracle Net to compromise Oracle OLAP.  Successful attacks of this vulnerability can result in takeover of Oracle OLAP. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).","summary":"Oracle Database Server OLAP component flaw (Oct 2026 CPU). A low-privileged user holding the DBMS_AW privilege can take over Oracle OLAP over Oracle Net. CVSS 8.8, with high confidentiality, integrity and availability impact. Affects 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Oracle Database Server","fixed":[],"affected":"19.3-19.32, 21.3-21.23, 23.4.0-23.26.3","ecosystem":"vendor"}],"ecosystems":[],"tags":["oracle-database","oracle-olap","package","self-hosted"],"not_affected_if":["auth-required","managed-hosting","olap-not-installed","unknown"],"how_to_check":"Check the version: SELECT banner_full FROM v$version, or opatch lspatches, and compare with the affected ranges. Check whether OLAP is installed: SELECT comp_id, status FROM dba_registry WHERE comp_id='OLAP'. Check who holds the privilege: SELECT grantee FROM dba_tab_privs WHERE table_name='DBMS_AW' (also check dba_role_privs for roles granting it). If OLAP is not installed and nobody has DBMS_AW, exposure is likely low, though Oracle's patch doc is the authority.","fix":"Apply the Oracle October 2026 Critical Patch Update for your release (via My Oracle Support patch availability document for Database); this means moving past 19.32, 21.23 and 23.26.3. Exact RU numbers not read. Workaround from Oracle and Armis: revoke DBMS_AW (and EXECUTE on it) from accounts that do not need it; this disables OLAP analytic workspace use for them.","status":"open","published_at":"2026-10-20T22:20:59+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-23T22:33:50+00:00","updated_at":"2026-10-23T23:52:02+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-23T22:33:49Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Oracle Critical Patch Update for the affected branches 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3; the advisory's patch version is not in the sources.","reach":"network","title":"Oracle Database OLAP: low-privilege user with DBMS_AW can take over","impact":"high","summary":"Oracle Database Server's OLAP component has a flaw that lets a low-privileged database user who holds the DBMS_AW privilege compromise OLAP over Oracle Net. A successful attack gives full takeover of the OLAP component, with high confidentiality, integrity and availability impact.","category":"package","who_cares":["oracle-database","oracle-olap","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"attacker takes over the OLAP component and reads or changes its data","analyst_note":"Find the Oracle Critical Patch Update advisory listing the fixed versions and whether OLAP is enabled by default, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-91563.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["auth-required","unknown"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000535,"input_tokens":3060,"output_tokens":459,"severity_before":"high"},"analyst_status":"done","analyst_note":"Find the Oracle Critical Patch Update advisory listing the fixed versions and whether OLAP is enabled by default, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-91563.","search":"'-19.32':70B,93C '-2026':14A,17A '-21.23':72B,95C '-91563':15A,18A '/av':146C '19.3':69B,92C '2026':39B '21.3':71B,94C '23.26.3':75B,98C '23.4.0':74B,97C '3.1':133C,145C '8.8':60B,136C 'access':112C 'affect':68B,90C 'allow':102C 'attack':105C,121C 'avail':66B,140C 'aw':10A,49B,108C 'base':134C 'compon':36B,81C 'compromis':117C 'confidenti':63B,137C 'cpu':40B 'cve':13A,16A 'cvss':59B,132C,142C,144C 'databas':2A,24B,33B,84C 'database':20A 'dbms':9A,48B,107C 'easili':99C 'exploit':100C 'flaw':37B 'h':154C 'h/a':153C 'h/i':152C 'high':62B 'hold':46B 'host':31B 'impact':67B,141C 'integr':64B,138C 'l/pr':148C 'l/ui':149C 'low':5A,43B,103C 'low-privileg':4A,42B 'n/ac':147C 'n/s':150C 'net':58B,115C 'network':111C 'oct':38B 'olap':3A,27B,35B,55B,80C,119C,131C 'oracl':1A,23B,26B,32B,54B,57B,79C,83C,114C,118C,130C 'oracle':19A 'oracle-databas':22B 'oracle-olap':25B 'packag':28B 'privileg':6A,44B,50B,104C,109C 'result':126C 'score':135C 'self':30B 'self-host':29B 'server':21A,34B,85C 'success':120C 'support':86C 'take':12A,52B 'takeov':128C 'u/c':151C 'user':7A,45B 'vector':143C 'version':87C 'via':113C 'vulner':76C,101C,124C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:59+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91563","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91563","severity":null,"published_at":"2026-10-20T22:20:59+00:00","modified_at":"2026-10-21T18:44:55+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-91563:534","url":null,"severity":null,"published_at":"2026-10-23T23:52:02+00:00","modified_at":"2026-10-23T23:52:02+00:00","first_seen_at":"2026-10-23T23:52:02+00:00","fetched_at":"2026-10-23T23:52:02+00:00","note":"Confirmed in Oracle CPU Oct 2026 (listed under Oracle Database Server 19.3-19.32, 21.3-21.23, 23.4.0-23.26.3) and CVE record: CVSS 8.8, AV:N/PR:L. Exact RU/patch numbers sit in the MOS patch availability doc (login needed), not read. Armis says patched beyond 19.32/21.23/23.26.3, which is a secondary source. OLAP default-enabled status not found. No exploitation or PoC found; X not searched."}],"documents":[{"id":1637,"url":"https://www.oracle.com/security-alerts/cpuoct2026.html","title":"Oracle Critical Patch Update Advisory - October 2026","kind":"advisory","source":"analyst","text":"Lists Oracle E-Business Suite, versions 12.2.3-12.2.15 as affected; patches via Patch Availability Document (MOS). Released 2026-10-20.","published_at":null,"relation":"advisory","confidence":null,"note":null},{"id":2208,"url":"https://cve.armis.com/CVE-2026-91563","title":"CVE-2026-91563 Armis (mitigation: revoke DBMS_AW)","kind":"other","source":"analyst","text":null,"published_at":null,"relation":"mitigation","confidence":null,"note":null},{"id":2209,"url":"https://www.cve.org/CVERecord?id=CVE-2026-91563","title":"CVE Record: CVE-2026-91563","kind":"advisory","source":"analyst","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}