{"id":"CVE-2026-91366","kind":"vulnerability","aliases":["CVE-2026-91366"],"related":[],"title":"Oracle Siebel CRM Cloud: adjacent-network flaw allows limited data read and write","description":"Vulnerability in the Siebel CRM Cloud Applications product of Oracle Siebel CRM (component: Siebel Cloud Manager).  Supported versions that are affected are 22.3-26.9. Difficult to exploit vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the Siebel CRM Cloud Applications executes to compromise Siebel CRM Cloud Applications.  While the vulnerability is in Siebel CRM Cloud Applications, 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 Cloud Applications accessible data as well as  unauthorized read access to a subset of Siebel CRM Cloud Applications accessible data. CVSS 3.1 Base Score 4.7 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N).","summary":"Oracle Siebel CRM Cloud Applications, via the Siebel Cloud Manager component, has a flaw that lets an unauthenticated attacker on the physical network segment of the hardware alter or delete some accessible data and read a subset of it. The attack is hard to carry out and needs adjacent network access rather than internet access.","severity":"medium","cvss":4.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["crm","oracle","self-hosted","siebel","vendor"],"not_affected_if":["internet-only-access","managed-hosting"],"how_to_check":"- unknown","fix":"- unknown","status":"open","published_at":"2026-10-20T22:20:39+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T04:35:04+00:00","updated_at":"2026-10-25T04:35:04+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T04:35:04Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Oracle Siebel CRM Cloud: adjacent-network flaw allows limited data read and write","impact":"medium","summary":"Oracle Siebel CRM Cloud Applications, via the Siebel Cloud Manager component, has a flaw that lets an unauthenticated attacker on the physical network segment of the hardware alter or delete some accessible data and read a subset of it. The attack is hard to carry out and needs adjacent network access rather than internet access.","category":"vendor","nicknames":[],"who_cares":["siebel","oracle","crm","self-hosted"],"confidence":0.6,"needs_auth":"no","worst_case":"Some CRM data can be read, changed or deleted by an adjacent attacker","analyst_note":"Check Oracle's Siebel CRM Cloud security alert or the CVE page for the patched version and whether self-hosted deployments are in scope.","how_to_check":"- unknown","needs_analyst":true,"not_affected_if":["managed-hosting","internet-only-access"],"who_is_affected":"Affects Siebel CRM Cloud Applications versions 22.3 through 26.9 as stated in the advisory. Exposure depends on whether an attacker can reach the physical or adjacent network segment where the hardware runs, which is unlikely for hosted deployments. Teams using only the vendor-managed cloud service can likely skip it, but the sources do not say which deployments are in scope.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000629,"input_tokens":3596,"output_tokens":539,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':16A,19A '-26.9':106C '-91366':17A,20A '/av':207C '22.3':105C '3.1':195C,206C '4.7':198C 'a/ac':208C 'access':59B,78B,82B,115C,168C,176C,183C,192C 'addit':151C 'adjac':6A,76B 'adjacent-network':5A 'affect':103C 'allow':9A,111C 'alter':55B 'applic':32B,89C,130C,137C,146C,175C,191C 'attach':121C 'attack':46B,68B,113C,147C,156C 'base':196C 'c/c':212C 'carri':72B 'chang':154C 'cloud':4A,31B,36B,88C,97C,129C,136C,145C,174C,190C 'communic':119C 'compon':38B,95C 'compromis':133C 'confidenti':199C 'crm':3A,21B,30B,87C,94C,128C,135C,144C,173C,189C 'cve':15A,18A 'cvss':194C,203C,205C 'data':11A,60B,177C,193C 'delet':57B,167C 'difficult':107C 'execut':131C 'exploit':109C 'flaw':8A,41B 'h/pr':209C 'hard':70B 'hardwar':54B,124C 'host':25B 'impact':150C,202C 'insert':165C 'integr':201C 'internet':81B 'l/a':214C 'l/i':213C 'let':43B 'limit':10A 'manag':37B,98C 'may':148C 'n':215C 'n/s':211C 'n/ui':210C 'need':75B 'network':7A,50B,77B 'oracl':1A,22B,28B,92C 'physic':49B,118C 'product':90C,152C 'rather':79B 'read':12A,62B,182C 'result':161C 'scope':153C 'score':197C 'segment':51B,120C 'self':24B 'self-host':23B 'siebel':2A,26B,29B,35B,86C,93C,96C,127C,134C,143C,172C,188C 'signific':149C 'subset':64B,186C 'success':155C 'support':99C 'unauthent':45B,112C 'unauthor':163C,181C 'updat':164C 'vector':204C 'vendor':27B 'version':100C 'via':33B 'vulner':83C,110C,140C,159C 'well':179C 'write':14A","nicknames":[],"mitigations":[],"who_affected":"Affects Siebel CRM Cloud Applications versions 22.3 through 26.9 as stated in the advisory. Exposure depends on whether an attacker can reach the physical or adjacent network segment where the hardware runs, which is unlikely for hosted deployments. Teams using only the vendor-managed cloud service can likely skip it, but the sources do not say which deployments are in scope.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:39+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91366","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91366","severity":null,"published_at":"2026-10-20T22:20:39+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"}