{"id":"CVE-2026-91639","kind":"vulnerability","aliases":["CVE-2026-91639"],"related":[],"title":"Oracle Essbase: low-privileged HTTP attacker gains access to critical 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 access to critical data or complete access to all Oracle Essbase accessible data. CVSS 3.1 Base Score 7.7 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).","summary":"Oracle Essbase 21.8.3.0.0 has a flaw in its Security component that lets a low-privileged user reach data over HTTP. Per the CVSS vector, a successful attack can expose critical data and may affect other products (scope change), with no integrity or availability impact listed.","severity":"high","cvss":7.7,"epss":0.00371,"exploited":false,"exploited_at":null,"products":[{"name":"oracle essbase","fixed":[],"affected":"= 21.8.3.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["http","oracle-essbase","self-hosted","vendor"],"not_affected_if":["no-http-exposure","other-version"],"how_to_check":"- Confirm the Essbase version with the installed build; the sources list 21.8.3.0.0 as affected\n- Check the Oracle Critical Patch Update advisory for the patch level that covers this CVE (unknown from the sources)","fix":"- Apply the Oracle patch for Essbase referenced in the Oracle advisory for CVE-2026-91639 (exact fixed version 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":"2026-10-25T03:10:36+00:00","updated_at":"2026-10-25T03:10:36+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:10:36Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle patch for Essbase referenced in the Oracle advisory for CVE-2026-91639 (exact fixed version unknown from the sources)","reach":"network","title":"Oracle Essbase: low-privileged HTTP attacker gains access to critical data","impact":"high","summary":"Oracle Essbase 21.8.3.0.0 has a flaw in its Security component that lets a low-privileged user reach data over HTTP. Per the CVSS vector, a successful attack can expose critical data and may affect other products (scope change), with no integrity or availability impact listed.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted","http"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker reads critical Essbase data and may reach other products","analyst_note":"Check the Oracle CPU advisory for the fixed version and any workaround; sources give only NVD and EPSS.","how_to_check":"- Confirm the Essbase version with the installed build; the sources list 21.8.3.0.0 as affected\n- Check the Oracle Critical Patch Update advisory for the patch level that covers this CVE (unknown from the sources)","needs_analyst":true,"not_affected_if":["other-version","no-http-exposure"],"who_is_affected":"Teams running Oracle Essbase 21.8.3.0.0 that expose its HTTP interface to a network where low-privileged accounts exist. Deployments not on that version or not reachable over HTTP from untrusted users are less exposed; the sources do not say more.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000642,"input_tokens":3519,"output_tokens":581,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-91639':15A,18A '/av':153C '21.8.3.0.0':31B,88C '3.1':143C,152C '7.7':146C 'access':9A,98C,129C,135C,140C 'addit':116C 'affect':63B,86C 'allow':92C 'attack':7A,56B,95C,112C,121C 'avail':72B 'base':144C 'c/c':158C 'chang':67B,119C 'complet':134C 'compon':38B,79C 'compromis':102C 'confidenti':147C 'critic':11A,59B,131C 'cve':13A,16A 'cvss':52B,142C,149C,151C 'data':12A,47B,60B,132C,141C 'easili':89C 'essbas':2A,24B,30B,78C,104C,111C,139C 'essbase':20A 'exploit':90C 'expos':58B 'flaw':34B 'gain':8A 'h/i':159C 'host':27B 'http':6A,21B,49B,100C 'impact':73B,115C,148C 'integr':70B 'l/pr':155C 'l/ui':156C 'let':40B 'list':74B 'low':4A,43B,93C 'low-privileg':3A,42B 'may':62B,113C 'n':161C 'n/a':160C 'n/ac':154C 'n/s':157C 'network':97C 'oracl':1A,23B,29B,77C,103C,110C,138C 'oracle':19A 'oracle-essbas':22B 'per':50B 'privileg':5A,44B,94C 'product':65B,117C 'reach':46B 'result':126C 'scope':66B,118C 'score':145C 'secur':37B,80C 'self':26B 'self-host':25B 'signific':114C 'success':55B,120C 'support':82C 'unauthor':128C 'user':45B 'vector':53B,150C 'vendor':28B 'version':83C 'via':99C 'vulner':75C,91C,107C,124C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase 21.8.3.0.0 that expose its HTTP interface to a network where low-privileged accounts exist. Deployments not on that version or not reachable over HTTP from untrusted users are less exposed; the sources do not say more.","tier":"B","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:H/I:N/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91639","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91639","severity":null,"published_at":"2026-10-20T22:21:03+00:00","modified_at":"2026-10-23T14:57:20+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-2026-91639","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91639","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"}