{"id":"CVE-2026-91390","kind":"vulnerability","aliases":["CVE-2026-91390"],"related":[],"title":"Oracle Siebel CRM End User: Open UI flaw exposes some data to changes","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 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 5.4 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/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 a low-privileged user over HTTP read and change a subset of accessible data when another person interacts with a crafted request. The sources say the attack can also affect other products (scope change), with a CVSS 3.1 base score of 5.4.","severity":"medium","cvss":5.4,"epss":0.00195,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["oracle","self-hosted","siebel-crm","vendor"],"not_affected_if":[],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-20T22:20:42+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:14:47+00:00","updated_at":"2026-10-25T12:38:52+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:14:47Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Oracle Siebel CRM End User: Open UI flaw exposes some data to changes","impact":"medium","summary":"Oracle Siebel CRM End User has a flaw in its Open UI component that lets a low-privileged user over HTTP read and change a subset of accessible data when another person interacts with a crafted request. The sources say the attack can also affect other products (scope change), with a CVSS 3.1 base score of 5.4.","category":"vendor","nicknames":[],"who_cares":["siebel-crm","oracle","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Some CRM data can be read, inserted, updated or deleted by a low-privileged user","analyst_note":"Check Oracle's Critical Patch Update advisory for the exact fixed Siebel CRM End User version and the patch for the Open UI component, since the sources give only the affected range.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Organisations running Siebel CRM End User in the affected supported version range 17.0 through 26.9, as stated by the sources. The sources do not say which deployment settings or roles make a site more exposed, so whether a given install is affected needs checking against Oracle's advisory.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000599,"input_tokens":3542,"output_tokens":489,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-26.9':108C '-91390':16A,19A '/av':209C '17.0':107C '3.1':81B,197C,208C '5.4':85B,200C 'access':56B,118C,170C,178C,185C,194C 'addit':153C 'affect':73B,105C 'allow':112C 'also':72B 'anoth':59B 'attack':70B,115C,128C,138C,149C,158C 'base':82B,198C 'c/c':214C 'chang':13A,52B,77B,156C 'compon':40B,98C 'compromis':122C 'confidenti':201C 'craft':64B 'crm':3A,26B,30B,90C,97C,124C,146C,175C,191C 'cve':14A,17A 'cvss':80B,196C,205C,207C 'data':11A,57B,179C,195C 'delet':169C 'easili':109C 'end':4A,31B,91C,125C,147C,176C,192C 'exploit':110C 'expos':9A 'flaw':8A,35B 'host':23B 'http':49B,120C 'human':130C 'impact':152C,204C 'insert':167C 'integr':203C 'interact':61B,131C 'l/a':216C 'l/i':215C 'l/pr':211C 'l/ui':212C 'let':42B 'low':45B,113C 'low-privileg':44B 'may':150C 'n':217C 'n/ac':210C 'network':117C 'open':6A,38B,99C 'oracl':1A,20B,28B,95C 'person':60B,134C 'privileg':46B,114C 'product':75B,93C,154C 'r/s':213C 'read':50B,184C 'request':65B 'requir':129C 'result':163C 'say':68B 'scope':76B,155C 'score':83B,199C 'self':22B 'self-host':21B 'siebel':2A,25B,29B,89C,96C,123C,145C,174C,190C 'siebel-crm':24B 'signific':151C 'sourc':67B 'subset':54B,188C 'success':127C,157C 'support':101C 'ui':7A,39B,100C 'unauthor':165C,183C 'updat':166C 'user':5A,32B,47B,92C,126C,148C,177C,193C 'vector':206C 'vendor':27B 'version':102C 'via':119C 'vulner':86C,111C,142C,161C 'well':181C","nicknames":[],"mitigations":[],"who_affected":"Organisations running Siebel CRM End User in the affected supported version range 17.0 through 26.9, as stated by the sources. The sources do not say which deployment settings or roles make a site more exposed, so whether a given install is affected needs checking against Oracle's advisory.","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:L/PR:L/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-2026-91390","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91390","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},{"source":"epss","external_id":"CVE-2026-91390","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91390","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"}