{"id":"CVE-2026-91651","kind":"vulnerability","aliases":["CVE-2026-91651"],"related":[],"title":"Oracle Essbase: Web Platform flaw lets low-privileged users take over server","description":"Vulnerability in Oracle Essbase (component: Essbase Web Platform).   The supported version that is affected is 21.8.3.0.0. Difficult to exploit 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 takeover of Oracle Essbase. CVSS 3.1 Base Score 8.5 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H).","summary":"Oracle Essbase's Web Platform component has a flaw that a low-privileged user can reach over HTTP. Successful exploitation can take over the Essbase server and affect other products through scope change.","severity":"high","cvss":8.5,"epss":0.003,"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":["default-config"],"how_to_check":"- Check the installed Essbase version against `21.8.3.0.0`\n- unknown","fix":"- Move Oracle Essbase off `21.8.3.0.0` to the fixed release listed in Oracle's Critical Patch Update advisory\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":"- Move Oracle Essbase off `21.8.3.0.0` to the fixed release listed in Oracle's Critical Patch Update advisory\n- unknown","reach":"network","title":"Oracle Essbase: Web Platform flaw lets low-privileged users take over server","impact":"high","summary":"Oracle Essbase's Web Platform component has a flaw that a low-privileged user can reach over HTTP. Successful exploitation can take over the Essbase server and affect other products through scope change.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker takes over the Essbase server and affects other products","analyst_note":"Find the fixed Essbase version and patch details in the Oracle CPU advisory; sources do not name it.","how_to_check":"- Check the installed Essbase version against `21.8.3.0.0`\n- unknown","needs_analyst":true,"not_affected_if":["default-config"],"who_is_affected":"Teams running Oracle Essbase version 21.8.3.0.0 with the Web Platform exposed to HTTP access. Exposure depends on whether users can reach the web interface over the network. Teams not running this Essbase version can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000593,"input_tokens":3526,"output_tokens":481,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-91651':16A,19A '/av':137C '21.8.3.0.0':78C '3.1':124C,136C '8.5':127C 'access':89C 'addit':107C 'affect':57B,76C 'allow':83C 'attack':86C,103C,112C 'avail':131C 'base':125C 'c/c':142C 'chang':62B,110C 'compon':34B,67C 'compromis':93C 'confidenti':128C 'cve':14A,17A 'cvss':123C,133C,135C 'difficult':79C 'essbas':2A,24B,30B,54B,66C,68C,95C,102C,122C 'essbase':21A 'exploit':49B,81C 'flaw':5A,37B 'h':145C 'h/a':144C 'h/i':143C 'h/pr':139C 'host':27B 'http':47B,91C 'impact':106C,132C 'integr':129C 'l/ui':140C 'let':6A 'low':8A,41B,84C 'low-privileg':7A,40B 'may':104C 'n/ac':138C 'n/s':141C 'network':88C 'oracl':1A,23B,29B,65C,94C,101C,121C 'oracle':20A 'oracle-essbas':22B 'platform':4A,33B,70C 'privileg':9A,42B,85C 'product':59B,108C 'reach':45B 'result':117C 'scope':61B,109C 'score':126C 'self':26B 'self-host':25B 'server':13A,55B 'signific':105C 'success':48B,111C 'support':72C 'take':11A,51B 'takeov':119C 'user':10A,43B 'vector':134C 'vendor':28B 'version':73C 'via':90C 'vulner':63C,82C,98C,115C 'web':3A,32B,69C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase version 21.8.3.0.0 with the Web Platform exposed to HTTP access. Exposure depends on whether users can reach the web interface over the network. Teams not running this Essbase version 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91651","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91651","severity":null,"published_at":"2026-10-20T22:21:05+00:00","modified_at":"2026-10-23T14:59:36+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-2026-91651","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91651","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"}