{"id":"CVE-2026-91653","kind":"vulnerability","aliases":["CVE-2026-91653"],"related":[],"title":"Oracle Essbase: low-privilege web flaw exposes critical data over HTTP","description":"Vulnerability in Oracle Essbase (component: Essbase Web Platform).   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 access to critical data or complete access to all Oracle Essbase accessible data as well as  unauthorized update, insert or delete access to some of Oracle Essbase accessible data. CVSS 3.1 Base Score 8.5 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N).","summary":"Oracle Essbase's Web Platform component has a flaw that lets a low-privileged user reach data over HTTP without user interaction. An attacker can read all data Essbase can access and modify or delete some of it, with scope change affecting other products.","severity":"high","cvss":8.5,"epss":0.00195,"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":["essbase-not-deployed"],"how_to_check":"- Check whether Oracle Essbase is deployed and which version runs, against `21.8.3.0.0`\n- unknown","fix":"- Apply the Oracle Critical Patch Update fix for Essbase; the fixed version is unknown from the sources\n- unknown","status":"open","published_at":"2026-10-20T22:21:05+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T03:00:23+00:00","updated_at":"2026-10-25T03:00:23+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:00:23Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Critical Patch Update fix for Essbase; the fixed version is unknown from the sources\n- unknown","reach":"network","title":"Oracle Essbase: low-privilege web flaw exposes critical data over HTTP","impact":"high","summary":"Oracle Essbase's Web Platform component has a flaw that lets a low-privileged user reach data over HTTP without user interaction. An attacker can read all data Essbase can access and modify or delete some of it, with scope change affecting other products.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted","enterprise"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker reads all Essbase data and alters some records","analyst_note":"Confirm the fixed version and any Oracle advisory or CPU details for CVE-2026-91653, since the sources give only the affected version.","how_to_check":"- Check whether Oracle Essbase is deployed and which version runs, against `21.8.3.0.0`\n- unknown","needs_analyst":true,"not_affected_if":["essbase-not-deployed"],"who_is_affected":"Teams running Oracle Essbase 21.8.3.0.0 with the Web Platform component reachable over HTTP from the network. Sources do not say whether a default configuration is exposed, so systems not running Essbase can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000615,"input_tokens":3570,"output_tokens":516,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-91653':15A,18A '/av':172C '21.8.3.0.0':89C '3.1':160C,171C '8.5':163C 'access':60B,99C,130C,136C,141C,151C,157C 'addit':117C 'affect':71B,87C 'allow':93C 'attack':53B,96C,113C,122C 'base':161C 'c/c':177C 'chang':70B,120C 'complet':135C 'compon':34B,78C 'compromis':103C 'confidenti':164C 'critic':9A,132C 'cve':13A,16A 'cvss':159C,168C,170C 'data':10A,46B,57B,133C,142C,158C 'delet':64B,150C 'easili':90C 'enterpris':21B 'essbas':2A,24B,30B,58B,77C,79C,105C,112C,140C,156C 'essbase':20A 'exploit':91C 'expos':8A 'flaw':7A,37B 'h/i':178C 'host':27B 'http':12A,48B,101C 'impact':116C,167C 'insert':148C 'integr':166C 'interact':51B 'l/a':179C 'l/pr':174C 'l/ui':175C 'let':39B 'low':4A,42B,94C 'low-privileg':3A,41B 'may':114C 'modifi':62B 'n':180C 'n/ac':173C 'n/s':176C 'network':98C 'oracl':1A,23B,29B,76C,104C,111C,139C,155C 'oracle':19A 'oracle-essbas':22B 'platform':33B,81C 'privileg':5A,43B,95C 'product':73B,118C 'reach':45B 'read':55B 'result':127C 'scope':69B,119C 'score':162C 'self':26B 'self-host':25B 'signific':115C 'success':121C 'support':83C 'unauthor':129C,146C 'updat':147C 'user':44B,50B 'vector':169C 'vendor':28B 'version':84C 'via':100C 'vulner':74C,92C,108C,125C 'web':6A,32B,80C 'well':144C 'without':49B","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase 21.8.3.0.0 with the Web Platform component reachable over HTTP from the network. Sources do not say whether a default configuration is exposed, so systems not running Essbase can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:21:05+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91653","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91653","severity":null,"published_at":"2026-10-20T22:21:05+00:00","modified_at":"2026-10-23T15:00:10+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-2026-91653","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91653","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"}