{"id":"CVE-2026-91420","kind":"vulnerability","aliases":["CVE-2026-91420"],"related":[],"title":"Oracle Siebel CRM Deployment: low-privilege HTTP user can modify 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 network access via HTTP to compromise Siebel CRM Deployment.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 6.5 (Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).","summary":"Oracle Siebel CRM Deployment, Server Infrastructure component, versions 17.0 through 26.9, has a flaw reachable over HTTP. A low-privileged attacker with network access can create, delete or modify critical data the product stores.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["enterprise","oracle","self-hosted","siebel-crm","vendor"],"not_affected_if":["unknown"],"how_to_check":"- Confirm the Siebel CRM Deployment version in use and compare it with the affected range 17.0-26.9 (unknown how to read the exact build from the sources)\n- Check Oracle's Siebel CRM security advisory for the patch level covering this CVE (unknown from the sources)","fix":"- Apply the Oracle Siebel CRM Deployment patch or update that covers this CVE, per Oracle's Critical Patch Update guidance (exact fixed version: unknown)\n- Restrict HTTP access to Siebel servers to trusted networks until patched (unknown from the sources)","status":"open","published_at":"2026-10-20T22:20:45+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T03:49:34+00:00","updated_at":"2026-10-25T03:49:34+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:49:34Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Siebel CRM Deployment patch or update that covers this CVE, per Oracle's Critical Patch Update guidance (exact fixed version: unknown)\n- Restrict HTTP access to Siebel servers to trusted networks until patched (unknown from the sources)","reach":"network","title":"Oracle Siebel CRM Deployment: low-privilege HTTP user can modify critical data","impact":"medium","summary":"Oracle Siebel CRM Deployment, Server Infrastructure component, versions 17.0 through 26.9, has a flaw reachable over HTTP. A low-privileged attacker with network access can create, delete or modify critical data the product stores.","category":"vendor","nicknames":[],"who_cares":["siebel-crm","oracle","self-hosted","enterprise"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker with a low-privilege account alters or deletes critical CRM data","analyst_note":"Find Oracle's advisory for CVE-2026-91420 to confirm fixed version, patch, and any workaround; sources give only the affected range.","how_to_check":"- Confirm the Siebel CRM Deployment version in use and compare it with the affected range 17.0-26.9 (unknown how to read the exact build from the sources)\n- Check Oracle's Siebel CRM security advisory for the patch level covering this CVE (unknown from the sources)","needs_analyst":true,"not_affected_if":["unknown"],"who_is_affected":"Organizations running Oracle Siebel CRM Deployment in the 17.0 to 26.9 range that expose its HTTP interface to users or networks with low-privilege accounts. The sources do not say which deployment modes or configurations are required, so teams on other versions or without network exposure to the HTTP interface can likely deprioritize it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000684,"input_tokens":3470,"output_tokens":673,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':15A,18A '-26.9':85C '-91420':16A,19A '/av':138C '17.0':37B,84C '26.9':39B '3.1':128C,137C '6.5':131C 'access':53B,95C,116C,125C 'affect':82C 'allow':89C 'attack':50B,92C,104C 'base':129C 'compon':35B,75C 'compromis':99C 'creat':55B 'creation':112C 'critic':12A,59B,118C 'crm':3A,27B,31B,68C,74C,101C,123C 'cve':14A,17A 'cvss':127C,134C,136C 'data':13A,60B,119C,126C 'delet':56B,113C 'deploy':4A,32B,69C,102C,124C 'easili':86C 'enterpris':20B 'exploit':87C 'flaw':42B 'h/a':145C 'host':24B 'http':8A,45B,97C 'impact':133C 'infrastructur':34B,77C 'integr':132C 'l/pr':140C 'l/ui':141C 'low':6A,48B,90C 'low-privileg':5A,47B 'modif':115C 'modifi':11A,58B 'n':146C 'n/ac':139C 'n/i':144C 'n/s':142C 'network':52B,94C 'oracl':1A,21B,29B,72C 'privileg':7A,49B,91C 'product':62B,70C 'reachabl':43B 'result':109C 'score':130C 'self':23B 'self-host':22B 'server':33B,76C 'siebel':2A,26B,30B,67C,73C,100C,122C 'siebel-crm':25B 'store':63B 'success':103C 'support':78C 'u/c':143C 'unauthor':111C 'user':9A 'vector':135C 'vendor':28B 'version':36B,79C 'via':96C 'vulner':64C,88C,107C","nicknames":[],"mitigations":[],"who_affected":"Organizations running Oracle Siebel CRM Deployment in the 17.0 to 26.9 range that expose its HTTP interface to users or networks with low-privilege accounts. The sources do not say which deployment modes or configurations are required, so teams on other versions or without network exposure to the HTTP interface can likely deprioritize 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:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91420","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91420","severity":null,"published_at":"2026-10-20T22:20:45+00:00","modified_at":"2026-10-23T21:17:25+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"}