{"id":"CVE-2026-91426","kind":"vulnerability","aliases":["CVE-2026-91426"],"related":[],"title":"Oracle Siebel CRM Deployment: low-privilege local user reads critical data","description":"Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure).  Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows low privileged attacker with logon to the infrastructure where Siebel CRM Deployment executes to compromise Siebel CRM Deployment.  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 5.5 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).","summary":"Oracle Siebel CRM Deployment, in its Server Infrastructure component, has a flaw that lets a low-privileged user who can log on to the host access data they should not see. The sources describe high confidentiality impact (CVSS 5.5, local vector) with no integrity or availability impact.","severity":"medium","cvss":5.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["on-prem","oracle","server-infrastructure","siebel-crm","vendor"],"not_affected_if":["no-local-logon","unsupported-version"],"how_to_check":"- Check the installed Siebel CRM Deployment version against the affected range 17.0-26.9 in the Oracle Siebel CRM advisory\n- unknown for other checks; the sources do not name config files or commands","fix":"- Apply the Oracle Siebel CRM Critical Patch Update that covers your release; the sources do not name a fixed version\n- unknown for other actions","status":"open","published_at":"2026-10-20T22:20:45+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:12:07+00:00","updated_at":"2026-10-25T04:12:07+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:12:07Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Siebel CRM Critical Patch Update that covers your release; the sources do not name a fixed version\n- unknown for other actions","reach":"local","title":"Oracle Siebel CRM Deployment: low-privilege local user reads critical data","impact":"high","summary":"Oracle Siebel CRM Deployment, in its Server Infrastructure component, has a flaw that lets a low-privileged user who can log on to the host access data they should not see. The sources describe high confidentiality impact (CVSS 5.5, local vector) with no integrity or availability impact.","category":"vendor","nicknames":[],"who_cares":["siebel-crm","oracle","on-prem","server-infrastructure"],"confidence":0.6,"needs_auth":"yes","worst_case":"Low-privileged local user reads critical Siebel CRM data","analyst_note":"Check Oracle's Siebel CRM Critical Patch Update advisory for the fixed version and any configuration that changes exposure.","how_to_check":"- Check the installed Siebel CRM Deployment version against the affected range 17.0-26.9 in the Oracle Siebel CRM advisory\n- unknown for other checks; the sources do not name config files or commands","needs_analyst":true,"not_affected_if":["unsupported-version","no-local-logon"],"who_is_affected":"Teams running Oracle Siebel CRM Deployment in the affected version range 17.0-26.9 where local users can log on to the server. The sources describe a local attack that needs low privileges, so exposure depends on who holds accounts on that infrastructure. Teams on other Siebel versions or without shell access to the host can likely skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000654,"input_tokens":3483,"output_tokens":612,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-26.9':99C '-91426':15A,18A '/av':156C '17.0':98C '3.1':146C,155C '5.5':69B,149C 'access':56B,131C,137C,143C 'affect':96C 'allow':103C 'attack':106C,123C 'avail':76B 'base':147C 'complet':136C 'compon':38B,89C 'compromis':118C 'confidenti':66B,150C 'critic':11A,133C 'crm':3A,28B,32B,82C,88C,114C,120C,141C 'cve':13A,16A 'cvss':68B,145C,152C,154C 'data':12A,57B,134C,144C 'deploy':4A,33B,83C,115C,121C,142C 'describ':64B 'easili':100C 'execut':116C 'exploit':101C 'flaw':41B 'h/i':162C 'high':65B 'host':55B 'impact':67B,77B,151C 'infrastructur':25B,37B,91C,111C 'integr':74B 'l/ac':157C 'l/pr':158C 'l/ui':159C 'let':43B 'local':8A,70B 'log':51B 'logon':108C 'low':6A,46B,104C 'low-privileg':5A,45B 'n':164C 'n/a':163C 'n/s':160C 'on-prem':19B 'oracl':1A,22B,30B,86C 'prem':21B 'privileg':7A,47B,105C 'product':84C 'read':10A 'result':128C 'score':148C 'see':61B 'server':24B,36B,90C 'server-infrastructur':23B 'siebel':2A,27B,31B,81C,87C,113C,119C,140C 'siebel-crm':26B 'sourc':63B 'success':122C 'support':92C 'u/c':161C 'unauthor':130C 'user':9A,48B 'vector':71B,153C 'vendor':29B 'version':93C 'vulner':78C,102C,126C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Siebel CRM Deployment in the affected version range 17.0-26.9 where local users can log on to the server. The sources describe a local attack that needs low privileges, so exposure depends on who holds accounts on that infrastructure. Teams on other Siebel versions or without shell access to the host can likely skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:45+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91426","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91426","severity":null,"published_at":"2026-10-20T22:20:45+00:00","modified_at":"2026-10-23T21:17:26+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"}