{"id":"CVE-2026-91642","kind":"vulnerability","aliases":["CVE-2026-91642"],"related":[],"title":"Oracle Essbase: unauthenticated HTTP flaw allows data change and partial denial of service","description":"Vulnerability in Oracle Essbase (component: Security).   The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated 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 7.3 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).","summary":"Oracle Essbase 21.8.3.0.0 has a security flaw reachable over HTTP without a login. An attacker can read, change or delete some Essbase data and partly disrupt the service.","severity":"high","cvss":7.3,"epss":0.00241,"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":["http-not-exposed","no-essbase-deployment"],"how_to_check":"- Confirm the Essbase version in use is `21.8.3.0.0` by checking the installed release in the Oracle Essbase server console or install directory\n- Check whether the Essbase HTTP endpoint is reachable from untrusted networks","fix":"- Apply the Oracle Critical Patch Update fix for Essbase; the fixed version is unknown from the sources\n- Restrict network access to the Essbase HTTP interface until patched","status":"open","published_at":"2026-10-20T22:21:04+00:00","first_seen_at":"2026-10-23T21:57:27+00:00","triaged_at":"2026-10-25T03:27:23+00:00","updated_at":"2026-10-25T03:27:23+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:27:23Z","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- Restrict network access to the Essbase HTTP interface until patched","reach":"network","title":"Oracle Essbase: unauthenticated HTTP flaw allows data change and partial denial of service","impact":"medium","summary":"Oracle Essbase 21.8.3.0.0 has a security flaw reachable over HTTP without a login. An attacker can read, change or delete some Essbase data and partly disrupt the service.","category":"vendor","nicknames":[],"who_cares":["oracle-essbase","self-hosted","enterprise"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker reads, changes or deletes some Essbase data and partly disrupts the service","analyst_note":"Confirm the fixed version and the Oracle Critical Patch Update advisory for CVE-2026-91642 from the NVD link and Oracle's advisory page.","how_to_check":"- Confirm the Essbase version in use is `21.8.3.0.0` by checking the installed release in the Oracle Essbase server console or install directory\n- Check whether the Essbase HTTP endpoint is reachable from untrusted networks","needs_analyst":true,"not_affected_if":["no-essbase-deployment","http-not-exposed"],"who_is_affected":"Teams running Oracle Essbase version 21.8.3.0.0 with the HTTP interface exposed to a network. The sources do not say whether other versions or deployment modes are affected. Systems not running Essbase, or with the HTTP interface not reachable from the network, are unlikely to be exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000662,"input_tokens":3556,"output_tokens":613,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-91642':16A,19A '/av':151C '21.8.3.0.0':32B,71C '3.1':138C,150C '7.3':141C 'abil':124C 'access':80C,100C,106C,113C,120C 'affect':69C 'allow':6A,75C 'attack':44B,77C,88C 'avail':145C 'base':139C 'caus':126C 'chang':8A,47B 'compon':62C 'compromis':84C 'confidenti':142C 'cve':14A,17A 'cvss':137C,147C,149C 'data':7A,52B,107C,121C 'delet':49B,99C 'denial':11A,129C 'disrupt':55B 'dos':133C 'easili':72C 'enterpris':22B 'essbas':2A,25B,31B,51B,61C,86C,105C,119C,136C 'essbase':21A 'exploit':73C 'flaw':5A,36B 'host':28B 'http':4A,39B,82C 'impact':146C 'insert':97C 'integr':143C 'l':159C 'l/a':158C 'l/i':157C 'l/pr':153C 'login':42B 'n/ac':152C 'n/s':155C 'n/ui':154C 'network':79C 'oracl':1A,24B,30B,60C,85C,104C,118C,135C 'oracle':20A 'oracle-essbas':23B 'part':54B 'partial':10A,128C,132C 'reachabl':37B 'read':46B,112C 'result':93C 'score':140C 'secur':35B,63C 'self':27B 'self-host':26B 'servic':13A,57B,131C 'subset':116C 'success':87C 'support':65C 'u/c':156C 'unauthent':3A,76C 'unauthor':95C,111C,123C 'updat':96C 'vector':148C 'vendor':29B 'version':66C 'via':81C 'vulner':58C,74C,91C 'well':109C 'without':40B","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Essbase version 21.8.3.0.0 with the HTTP interface exposed to a network. The sources do not say whether other versions or deployment modes are affected. Systems not running Essbase, or with the HTTP interface not reachable from the network, are unlikely to be exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:21:04+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/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-2026-91642","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91642","severity":null,"published_at":"2026-10-20T22:21:04+00:00","modified_at":"2026-10-23T14:57:53+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-2026-91642","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91642","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"}