{"id":"CVE-2026-69901","kind":"vulnerability","aliases":["CVE-2026-69901"],"related":[],"title":"Microsoft Teams for Android: origin check flaw allows network spoofing","description":"Origin validation error in Microsoft Teams for Android allows an unauthorized attacker to perform spoofing over a network.","summary":"Microsoft Teams for Android fails to properly validate where a message or request comes from, so an unauthorized attacker on the network can impersonate a legitimate source. The sources do not describe what exactly can be spoofed or what data is exposed.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["android","microsoft-teams","vendor"],"not_affected_if":[],"how_to_check":"- Check the installed Microsoft Teams app version on Android against the vendor's advisory for CVE-2026-69901: unknown\n- Confirm whether the app is managed through an MDM and which Teams build it is pushing: unknown","fix":null,"status":"open","published_at":"2026-11-10T19:21:19+00:00","first_seen_at":"2026-11-10T19:25:17+00:00","triaged_at":"2026-11-10T19:43:04+00:00","updated_at":"2026-11-10T19:43:04+00:00","category":"vendor","confidence":0.5,"triage":{"at":"2026-11-10T19:43:04Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft Teams for Android: origin check flaw allows network spoofing","impact":"medium","summary":"Microsoft Teams for Android fails to properly validate where a message or request comes from, so an unauthorized attacker on the network can impersonate a legitimate source. The sources do not describe what exactly can be spoofed or what data is exposed.","audience":"everyone","category":"vendor","nicknames":[],"who_cares":["microsoft-teams","android"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker impersonates a trusted source inside Teams","analyst_note":"Check Microsoft's CVE-2026-69901 advisory for affected Android versions, the fixed build, and the exact spoofing scenario.","how_to_check":"- Check the installed Microsoft Teams app version on Android against the vendor's advisory for CVE-2026-69901: unknown\n- Confirm whether the app is managed through an MDM and which Teams build it is pushing: unknown","plain_action":"Update the Microsoft Teams app on your Android phone through the Google Play Store as soon as an update is available.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Users of Microsoft Teams for Android who are on a network an attacker can reach. The sources do not state the affected version range or the exact spoofing scenario.","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000713,"input_tokens":4494,"output_tokens":527,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Check Microsoft's CVE-2026-69901 advisory for affected Android versions, the fixed build, and the exact spoofing scenario.","search":"'-2026':12A,15A '-69901':13A,16A 'allow':8A,72C 'android':4A,17B,25B,71C 'attack':40B,75C 'check':6A 'come':35B 'cve':11A,14A 'data':61B 'describ':53B 'error':66C 'exact':55B 'expos':63B 'fail':26B 'flaw':7A 'imperson':45B 'legitim':47B 'messag':32B 'microsoft':1A,19B,22B,68C 'microsoft-team':18B 'network':9A,43B,81C 'origin':5A,64C 'perform':77C 'proper':28B 'request':34B 'sourc':48B,50B 'spoof':10A,58B,78C 'team':2A,20B,23B,69C 'unauthor':39B,74C 'valid':29B,65C 'vendor':21B","nicknames":[],"mitigations":[],"who_affected":"Users of Microsoft Teams for Android who are on a network an attacker can reach. The sources do not state the affected version range or the exact spoofing scenario.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"everyone","plain_action":"Update the Microsoft Teams app on your Android phone through the Google Play Store as soon as an update is available.","pkeys":[],"ptokens":[],"labels":["android","high","microsoftteams","vendor"],"campaign_type":null,"search_a":"'-2026':12A,15A '-69901':13A,16A 'allow':8A 'android':4A 'check':6A 'cve':11A,14A 'flaw':7A 'microsoft':1A 'network':9A 'origin':5A 'spoof':10A 'team':2A","search_b":"'android':17B,25B 'attack':40B 'come':35B 'data':61B 'describ':53B 'exact':55B 'expos':63B 'fail':26B 'imperson':45B 'legitim':47B 'messag':32B 'microsoft':19B,22B 'microsoft-team':18B 'network':43B 'proper':28B 'request':34B 'sourc':48B,50B 'spoof':58B 'team':20B,23B 'unauthor':39B 'valid':29B 'vendor':21B","search_c":"'allow':72C 'android':71C 'attack':75C 'error':66C 'microsoft':68C 'network':81C 'origin':64C 'perform':77C 'spoof':78C 'team':69C 'unauthor':74C 'valid':65C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:21:19+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-69901","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69901","severity":null,"published_at":"2026-11-10T19:21:19+00:00","modified_at":"2026-11-10T19:21:20+00:00","first_seen_at":"2026-11-10T19:25:17+00:00","fetched_at":"2026-11-10T19:25:17+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}