{"id":"CVE-2026-91654","kind":"vulnerability","aliases":["CVE-2026-91654"],"related":[],"title":"Oracle Essbase: low-privilege HTTP attacker can read, change and disrupt 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.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Oracle Essbase accessible data as well as  unauthorized read access to a subset of Oracle Essbase accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 6.3 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).","summary":"Oracle Essbase 21.8.3.0.0 has a Security component flaw that lets a low-privilege user reach it over HTTP. A successful attack can read and modify a subset of accessible data and partly disrupt the service.","severity":"medium","cvss":6.3,"epss":0.00175,"exploited":false,"exploited_at":null,"products":[{"name":"oracle essbase","fixed":[],"affected":"= 21.8.3.0.0","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["enterprise-bi","oracle-essbase","vendor"],"not_affected_if":["fixed-version","no-http-access"],"how_to_check":"- Confirm the installed Essbase version is `21.8.3.0.0` (the sources list this as the affected version)\n- Check Oracle's April 2026 Critical Patch Update advisory for the Essbase entry (unknown whether the sources name a specific patch)","fix":"- Apply the Oracle patch for Essbase that addresses CVE-2026-91654 (the fixed version is unknown from the sources)\n- Restrict HTTP access to Essbase to trusted networks until patched","status":"open","published_at":"2026-10-20T22:21:05+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T04:01:29+00:00","updated_at":"2026-10-25T04:01:29+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:01:29Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle patch for Essbase that addresses CVE-2026-91654 (the fixed version is unknown from the sources)\n- Restrict HTTP access to Essbase to trusted networks until patched","reach":"network","title":"Oracle Essbase: low-privilege HTTP attacker can read, change and disrupt data","impact":"medium","summary":"Oracle Essbase 21.8.3.0.0 has a Security component flaw that lets a low-privilege user reach it over HTTP. A successful attack can read and modify a subset of accessible data and partly disrupt the service.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","enterprise-bi"],"confidence":0.6,"needs_auth":"yes","worst_case":"low-privilege user reads and modifies some Essbase data","analyst_note":"Find the Oracle CPU advisory entry for Essbase 21.8.3.0.0 to confirm the fixed version and any workaround (https://nvd.nist.gov/vuln/detail/CVE-2026-91654).","how_to_check":"- Confirm the installed Essbase version is `21.8.3.0.0` (the sources list this as the affected version)\n- Check Oracle's April 2026 Critical Patch Update advisory for the Essbase entry (unknown whether the sources name a specific patch)","needs_analyst":true,"not_affected_if":["no-http-access","fixed-version"],"who_is_affected":"Teams running Oracle Essbase 21.8.3.0.0 that expose its HTTP interface to users or networks beyond the administrators. Exposure depends on how many low-privilege accounts exist and whether those accounts can reach the service over the network. Teams on other Essbase versions or without HTTP access can likely skip it, though the sources do not confirm the exact range.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000688,"input_tokens":3555,"output_tokens":665,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-91654':16A,19A '/av':159C '21.8.3.0.0':31B,78C '3.1':146C,158C '6.3':149C 'abil':132C 'access':58B,88C,108C,114C,121C,128C 'affect':76C 'allow':82C 'attack':7A,50B,85C,96C 'avail':153C 'base':147C 'bi':24B 'caus':134C 'chang':10A 'compon':35B,69C 'compromis':92C 'confidenti':150C 'cve':14A,17A 'cvss':145C,155C,157C 'data':13A,59B,115C,129C 'delet':107C 'denial':137C 'disrupt':12A,62B 'dos':141C 'easili':79C 'enterpris':23B 'enterprise-bi':22B 'essbas':2A,27B,30B,68C,94C,113C,127C,144C 'essbase':21A 'exploit':80C 'flaw':36B 'http':6A,47B,90C 'impact':154C 'insert':105C 'integr':151C 'l':167C 'l/a':166C 'l/i':165C 'l/pr':161C 'l/ui':162C 'let':38B 'low':4A,41B,83C 'low-privileg':3A,40B 'modifi':54B 'n/ac':160C 'n/s':163C 'network':87C 'oracl':1A,26B,29B,67C,93C,112C,126C,143C 'oracle':20A 'oracle-essbas':25B 'part':61B 'partial':136C,140C 'privileg':5A,42B,84C 'reach':44B 'read':9A,52B,120C 'result':101C 'score':148C 'secur':34B,70C 'servic':64B,139C 'subset':56B,124C 'success':49B,95C 'support':72C 'u/c':164C 'unauthor':103C,119C,131C 'updat':104C 'user':43B 'vector':156C 'vendor':28B 'version':73C 'via':89C 'vulner':65C,81C,99C 'well':117C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase 21.8.3.0.0 that expose its HTTP interface to users or networks beyond the administrators. Exposure depends on how many low-privilege accounts exist and whether those accounts can reach the service over the network. Teams on other Essbase versions or without HTTP access can likely skip it, though the sources do not confirm the exact range.","tier":"C","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:U/C:L/I:L/A:L","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91654","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91654","severity":null,"published_at":"2026-10-20T22:21:05+00:00","modified_at":"2026-10-23T14:57:02+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-2026-91654","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91654","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"}