{"id":"CVE-2026-91387","kind":"vulnerability","aliases":["CVE-2026-91387"],"related":[],"title":"Oracle Siebel CRM End User: Open UI flaw exposes and alters some records","description":"Vulnerability in the Siebel CRM End User product of Oracle Siebel CRM (component: Open UI).  Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM End User.  Successful attacks of this vulnerability can result in  unauthorized update, insert or delete access to some of Siebel CRM End User accessible data as well as  unauthorized read access to a subset of Siebel CRM End User accessible data. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).","summary":"Oracle Siebel CRM End User has a flaw in its Open UI component that lets a low-privileged user reach the application over HTTP. A successful attacker can read a subset of accessible data and update, insert or delete some accessible data.","severity":"medium","cvss":5.4,"epss":0.00221,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["enterprise-crm","oracle-siebel-crm","siebel-end-user","vendor"],"not_affected_if":["unknown"],"how_to_check":"- Confirm whether Siebel CRM End User is deployed and which release is running, as listed in the affected range `17.0` to `26.9`\n- unknown","fix":"- Apply the patch from Oracle's Siebel CRM security advisory for the affected release (version not stated in the sources)\n- unknown","status":"open","published_at":"2026-10-20T22:20:41+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:14:49+00:00","updated_at":"2026-10-25T12:38:52+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:14:49Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the patch from Oracle's Siebel CRM security advisory for the affected release (version not stated in the sources)\n- unknown","reach":"network","title":"Oracle Siebel CRM End User: Open UI flaw exposes and alters some records","impact":"medium","summary":"Oracle Siebel CRM End User has a flaw in its Open UI component that lets a low-privileged user reach the application over HTTP. A successful attacker can read a subset of accessible data and update, insert or delete some accessible data.","category":"vendor","nicknames":[],"who_cares":["oracle-siebel-crm","siebel-end-user","enterprise-crm"],"confidence":0.6,"needs_auth":"yes","worst_case":"Some CRM records readable, updated, inserted or deleted by low-privileged users","analyst_note":"Find Oracle's Siebel CRM security advisory for the fixed build and the Open UI component details, since the sources give no fix version or check steps.","how_to_check":"- Confirm whether Siebel CRM End User is deployed and which release is running, as listed in the affected range `17.0` to `26.9`\n- unknown","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organizations running Oracle Siebel CRM End User with the Open UI component in the affected release range, where low-privileged users can reach it over the network. Sources do not say which configurations are exposed, so teams on other Siebel releases or without Open UI exposure can likely skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000625,"input_tokens":3485,"output_tokens":553,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-26.9':97C '-91387':16A,19A '/av':168C '17.0':96C '3.1':156C,167C '5.4':159C 'access':65B,73B,107C,129C,137C,144C,153C 'affect':94C 'allow':101C 'alter':11A 'applic':54B 'attack':59B,104C,117C 'base':157C 'compon':44B,87C 'compromis':111C 'confidenti':160C 'crm':3A,22B,26B,34B,79C,86C,113C,134C,150C 'cve':14A,17A 'cvss':155C,164C,166C 'data':66B,74B,138C,154C 'delet':71B,128C 'easili':98C 'end':4A,29B,35B,80C,114C,135C,151C 'enterpris':21B 'enterprise-crm':20B 'exploit':99C 'expos':9A 'flaw':8A,39B 'http':56B,109C 'impact':163C 'insert':69B,126C 'integr':162C 'l/a':175C 'l/i':174C 'l/pr':170C 'l/ui':171C 'let':46B 'low':49B,102C 'low-privileg':48B 'n':176C 'n/ac':169C 'n/s':172C 'network':106C 'open':6A,42B,88C 'oracl':1A,24B,32B,84C 'oracle-siebel-crm':23B 'privileg':50B,103C 'product':82C 'reach':52B 'read':61B,143C 'record':13A 'result':122C 'score':158C 'siebel':2A,25B,28B,33B,78C,85C,112C,133C,149C 'siebel-end-us':27B 'subset':63B,147C 'success':58B,116C 'support':90C 'u/c':173C 'ui':7A,43B,89C 'unauthor':124C,142C 'updat':68B,125C 'user':5A,30B,36B,51B,81C,115C,136C,152C 'vector':165C 'vendor':31B 'version':91C 'via':108C 'vulner':75C,100C,120C 'well':140C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Oracle Siebel CRM End User with the Open UI component in the affected release range, where low-privileged users can reach it over the network. Sources do not say which configurations are exposed, so teams on other Siebel releases or without Open UI exposure can likely skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:41+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91387","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91387","severity":null,"published_at":"2026-10-20T22:20:41+00:00","modified_at":"2026-10-21T18:45:11+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","fetched_at":"2026-10-23T22:29:00+00:00","note":null},{"source":"epss","external_id":"CVE-2026-91387","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91387","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-25T12:38:52+00:00","fetched_at":"2026-10-25T12:38:52+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"}