{"id":"CVE-2026-91355","kind":"vulnerability","aliases":["CVE-2026-91355"],"related":[],"title":"Oracle Outside In: local flaw lets a logged-on user take over the SDK","description":"Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Clean Content SDK).   The supported version that is affected is 8.5.8. Easily exploitable vulnerability allows unauthenticated attacker with logon to the infrastructure where Oracle Outside In Technology executes to compromise Oracle Outside In Technology.  Successful attacks of this vulnerability can result in takeover of Oracle Outside In Technology. CVSS 3.1 Base Score 8.4 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).","summary":"Oracle Outside In Technology, part of Oracle Fusion Middleware, has a flaw in its Clean Content SDK that affects version 8.5.8. A local attacker with a logon to the machine where it runs can compromise the product and take it over.","severity":"high","cvss":8.4,"epss":0.00164,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["fusion-middleware","on-prem","oracle","outside-in","vendor"],"not_affected_if":["sdk-not-installed"],"how_to_check":"- Check the installed Outside In Clean Content SDK version against the affected version `8.5.8` in your Oracle Fusion Middleware inventory\n- unknown","fix":"- Apply the Oracle Critical Patch Update fix for Outside In Technology; the fixed version is unknown from the sources\n- unknown","status":"open","published_at":"2026-10-20T22:20:38+00:00","first_seen_at":"2026-10-23T21:57:26+00:00","triaged_at":"2026-10-25T03:01:44+00:00","updated_at":"2026-10-25T12:38:52+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-25T03:01:44Z","model":"claude-haiku-5-5","output":{"fix":"- Apply the Oracle Critical Patch Update fix for Outside In Technology; the fixed version is unknown from the sources\n- unknown","reach":"local","title":"Oracle Outside In: local flaw lets a logged-on user take over the SDK","impact":"high","summary":"Oracle Outside In Technology, part of Oracle Fusion Middleware, has a flaw in its Clean Content SDK that affects version 8.5.8. A local attacker with a logon to the machine where it runs can compromise the product and take it over.","category":"vendor","nicknames":[],"who_cares":["oracle","fusion-middleware","outside-in","on-prem"],"confidence":0.6,"needs_auth":"yes","worst_case":"attacker takes over the SDK on a host they can log into","analyst_note":"Check the Oracle Critical Patch Update advisory for the fixed version and the exact affected component list; the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-91355 gave no fix version.","how_to_check":"- Check the installed Outside In Clean Content SDK version against the affected version `8.5.8` in your Oracle Fusion Middleware inventory\n- unknown","needs_analyst":true,"not_affected_if":["sdk-not-installed"],"who_is_affected":"Teams running Oracle Fusion Middleware with the Outside In Clean Content SDK version 8.5.8 on servers where local users can log on. Exposure depends on who has shell or logon access to those hosts. Systems without the SDK can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000634,"input_tokens":3478,"output_tokens":573,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':17A,20A '-91355':18A,21A '/av':149C '3.1':136C,148C '8.4':139C '8.5.8':53B,97C 'affect':51B,95C 'allow':101C 'attack':56B,103C,122C 'avail':143C 'base':137C 'clean':47B,87C 'compon':84C 'compromis':67B,116C 'confidenti':140C 'content':48B,88C 'cve':16A,19A 'cvss':135C,145C,147C 'easili':98C 'execut':114C 'exploit':99C 'flaw':5A,44B 'fusion':23B,40B,82C 'fusion-middlewar':22B 'h':157C 'h/a':156C 'h/i':155C 'impact':144C 'infrastructur':108C 'integr':141C 'l/ac':150C 'l/pr':151C 'let':6A 'local':4A,55B 'log':9A 'logged-on':8A 'logon':59B,105C 'machin':62B 'middlewar':24B,41B,83C 'n/s':153C 'n/ui':152C 'on-prem':25B 'oracl':1A,28B,33B,39B,75C,81C,110C,117C,131C 'outsid':2A,30B,34B,76C,85C,111C,118C,132C 'outside-in':29B 'part':37B 'prem':27B 'product':69B,79C 'result':127C 'run':65B 'score':138C 'sdk':15A,49B,89C 'success':121C 'support':91C 'take':12A,71B 'takeov':129C 'technolog':36B,78C,113C,120C,134C 'u/c':154C 'unauthent':102C 'user':11A 'vector':146C 'vendor':32B 'version':52B,92C 'vulner':72C,100C,125C","nicknames":[],"mitigations":[],"who_affected":"Teams running Oracle Fusion Middleware with the Outside In Clean Content SDK version 8.5.8 on servers where local users can log on. Exposure depends on who has shell or logon access to those hosts. Systems without the SDK can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-20T22:20:38+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secalert_us@oracle.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91355","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91355","severity":null,"published_at":"2026-10-20T22:20:38+00:00","modified_at":"2026-10-21T18:44:40+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-2026-91355","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91355","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"}