{"id":"CVE-2026-91388","kind":"vulnerability","aliases":["CVE-2026-91388"],"related":[],"title":"Oracle Siebel CRM End User: Open UI flaw allows data read and write","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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM End User.  Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Siebel CRM End User, attacks may significantly impact additional products (scope change). 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 4.7 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N).","summary":"Oracle Siebel CRM End User has a flaw in its Open UI component that lets an unauthenticated attacker reach the application over HTTP. A successful attack, which needs a user to interact with a crafted request, can read and modify a subset of the CRM data the user can access.","severity":"medium","cvss":4.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["oracle","self-hosted","siebel-crm","vendor"],"not_affected_if":["unsupported-version"],"how_to_check":"- Check the installed Siebel CRM version against the affected range 17.0 to 26.9 in the Oracle advisory\n- unknown","fix":"- Apply the Oracle Critical Patch Update fix for Siebel CRM, per the Oracle advisory\n- unknown","status":"open","published_at":"2026-10-20T22:20:42+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:35:01+00:00","updated_at":"2026-10-25T04:35:01+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-25T04:35:01Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Critical Patch Update fix for Siebel CRM, per the Oracle advisory\n- unknown","reach":"internet","title":"Oracle Siebel CRM End User: Open UI flaw allows data read and write","impact":"medium","summary":"Oracle Siebel CRM End User has a flaw in its Open UI component that lets an unauthenticated attacker reach the application over HTTP. A successful attack, which needs a user to interact with a crafted request, can read and modify a subset of the CRM data the user can access.","category":"vendor","nicknames":[],"who_cares":["siebel-crm","oracle","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker reads and modifies some CRM data through a user's session","analyst_note":"Check the Oracle Critical Patch Update advisory for the patched Siebel CRM versions and the exact fix steps, since the sources give no fix or check.","how_to_check":"- Check the installed Siebel CRM version against the affected range 17.0 to 26.9 in the Oracle advisory\n- unknown","needs_analyst":true,"not_affected_if":["unsupported-version"],"who_is_affected":"Organizations running Siebel CRM End User in the affected versions 17.0 through 26.9 with the Open UI component exposed over HTTP. Sites that do not run Siebel CRM End User, or run a version outside that range, can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000623,"input_tokens":3545,"output_tokens":537,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-26.9':100C '-91388':16A,19A '/av':201C '17.0':99C '3.1':189C,200C '4.7':192C 'access':77B,110C,162C,170C,177C,186C 'addit':145C 'affect':97C 'allow':9A,105C 'applic':48B 'attack':45B,53B,107C,120C,130C,141C,150C 'base':190C 'c/c':206C 'chang':148C 'compon':40B,90C 'compromis':114C 'confidenti':193C 'craft':62B 'crm':3A,26B,30B,72B,82C,89C,116C,138C,167C,183C 'cve':14A,17A 'cvss':188C,197C,199C 'data':10A,73B,171C,187C 'delet':161C 'difficult':101C 'end':4A,31B,83C,117C,139C,168C,184C 'exploit':103C 'flaw':8A,35B 'h/pr':203C 'host':23B 'http':50B,112C 'human':122C 'impact':144C,196C 'insert':159C 'integr':195C 'interact':59B,123C 'l/a':208C 'l/i':207C 'let':42B 'may':142C 'modifi':67B 'n':209C 'n/ac':202C 'n/ui':204C 'need':55B 'network':109C 'open':6A,38B,91C 'oracl':1A,20B,28B,87C 'person':126C 'product':85C,146C 'r/s':205C 'reach':46B 'read':11A,65B,176C 'request':63B 'requir':121C 'result':155C 'scope':147C 'score':191C 'self':22B 'self-host':21B 'siebel':2A,25B,29B,81C,88C,115C,137C,166C,182C 'siebel-crm':24B 'signific':143C 'subset':69B,180C 'success':52B,119C,149C 'support':93C 'ui':7A,39B,92C 'unauthent':44B,106C 'unauthor':157C,175C 'updat':158C 'user':5A,32B,57B,75B,84C,118C,140C,169C,185C 'vector':198C 'vendor':27B 'version':94C 'via':111C 'vulner':78C,104C,134C,153C 'well':173C 'write':13A","nicknames":[],"mitigations":[],"who_affected":"Organizations running Siebel CRM End User in the affected versions 17.0 through 26.9 with the Open UI component exposed over HTTP. Sites that do not run Siebel CRM End User, or run a version outside that range, can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:42+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91388","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91388","severity":null,"published_at":"2026-10-20T22:20:42+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}],"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"}