{"id":"CVE-2026-83938","kind":"vulnerability","aliases":["CVE-2026-83938"],"related":[],"title":"Azure Kubernetes Configuration Service: missing auth lets attackers elevate privileges","description":"Missing authentication for critical function in Azure Kubernetes Configuration Service allows an unauthorized attacker to elevate privileges over a network.","summary":"Azure Kubernetes Configuration Service exposes a critical function without requiring authentication. An unauthorized attacker on the network can elevate privileges.","severity":"critical","cvss":10.0,"epss":0.00668,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["aks","azure","infrastructure","kubernetes"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"resolved","published_at":"2026-10-22T22:19:18+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","triaged_at":"2026-10-23T22:31:39+00:00","updated_at":"2026-10-24T07:15:51+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-10-23T22:31:39Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Azure Kubernetes Configuration Service: missing auth lets attackers elevate privileges","impact":"high","summary":"Azure Kubernetes Configuration Service exposes a critical function without requiring authentication. An unauthorized attacker on the network can elevate privileges.","category":"infrastructure","who_cares":["azure","kubernetes","aks"],"confidence":0.5,"needs_auth":"no","worst_case":"unauthenticated attacker gains elevated privileges over the network","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-83938 for affected AKS versions, the patch or required action, and whether a customer-side fix is needed; the sources here give no versions.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000452,"input_tokens":2878,"output_tokens":329,"severity_before":"critical"},"analyst_status":"done","analyst_note":"Check the Microsoft Security Response Center advisory for CVE-2026-83938 for affected versions, patched build, and whether a customer action is required; NVD text alone gives no fix.","search":"'-2026':12A,15A '-83938':13A,16A 'ak':17B 'allow':51C 'attack':8A,34B,54C 'auth':6A 'authent':31B,42C 'azur':1A,18B,21B,47C 'configur':3A,23B,49C 'critic':27B,44C 'cve':11A,14A 'elev':9A,39B,56C 'expos':25B 'function':28B,45C 'infrastructur':19B 'kubernet':2A,20B,22B,48C 'let':7A 'miss':5A,41C 'network':37B,60C 'privileg':10A,40B,57C 'requir':30B 'servic':4A,24B,50C 'unauthor':33B,53C 'without':29B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T22:19:18+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-83938","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83938","severity":null,"published_at":"2026-10-22T22:19:18+00:00","modified_at":"2026-10-23T19:43:46+00:00","first_seen_at":"2026-10-23T21:57:32+00:00","fetched_at":"2026-10-23T22:29:03+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-83938:146","url":null,"severity":null,"published_at":"2026-10-23T21:59:31+00:00","modified_at":"2026-10-23T21:59:31+00:00","first_seen_at":"2026-10-23T21:59:31+00:00","fetched_at":"2026-10-23T21:59:31+00:00","note":"MSRC advisory (Oct 22 2026): cloud service CVE, already fully mitigated by Microsoft, no customer action. Not exploited, not publicly disclosed, no PoC. Did not search social; no CVE-id chatter expected."},{"source":"epss","external_id":"CVE-2026-83938","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-83938","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-25T12:38:51+00:00","note":null}],"documents":[{"id":1254,"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83938","title":"MSRC: CVE-2026-83938 Azure Kubernetes Configuration Service Elevation of Privilege","kind":"advisory","source":"analyst","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}