{"id":"CVE-2026-121663","kind":"vulnerability","aliases":["CVE-2026-121663"],"related":[],"title":"Visual Studio Code: incomplete input filter lets attackers bypass a security feature","description":"Incomplete list of disallowed inputs in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.","summary":"Visual Studio Code has an incomplete list of disallowed inputs that lets an unauthorized attacker bypass a security feature over the network. The sources do not state what the bypassed feature protects or what the attacker gains beyond that.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Visual Studio Code","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["developer-tools","runtime","visual-studio-code"],"not_affected_if":[],"how_to_check":"- Check the installed Visual Studio Code version (Help > About) against the fixed version, which the sources do not state","fix":null,"status":"open","published_at":"2026-11-10T19:20:29+00:00","first_seen_at":"2026-11-10T19:25:08+00:00","triaged_at":"2026-11-10T19:27:47+00:00","updated_at":"2026-11-10T19:27:47+00:00","category":"runtime","confidence":0.5,"triage":{"at":"2026-11-10T19:27:47Z","model":"claude-haiku-5-5","output":{"fix":"- unknown","reach":"network","title":"Visual Studio Code: incomplete input filter lets attackers bypass a security feature","impact":"medium","summary":"Visual Studio Code has an incomplete list of disallowed inputs that lets an unauthorized attacker bypass a security feature over the network. The sources do not state what the bypassed feature protects or what the attacker gains beyond that.","audience":"developers","category":"runtime","nicknames":[],"who_cares":["visual-studio-code","developer-tools"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"unknown security feature bypassed over the network by an unauthorized attacker","analyst_note":"Find the vendor advisory for CVE-2026-121663 to confirm the bypassed feature, the affected and fixed Visual Studio Code versions, and any required setting.","how_to_check":"- Check the installed Visual Studio Code version (Help > About) against the fixed version, which the sources do not state\n- unknown","plain_action":"","product_name":"Visual Studio Code","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Teams that run Visual Studio Code, including remote or tunnelled setups where the editor is reachable over a network, are the likely exposure. The sources do not say which configuration or feature is needed to reach the bypass, so whether a given install is affected is unknown.","user_interaction":"unknown","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.00072,"input_tokens":4502,"output_tokens":539,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the vendor advisory for CVE-2026-121663 to confirm the bypassed feature, the affected and fixed Visual Studio Code versions, and any required setting.","search":"'-121663':15A,18A '-2026':14A,17A 'allow':77C 'attack':8A,44B,65B,80C 'beyond':67B 'bypass':9A,45B,59B,82C 'code':3A,21A,29B,32B,76C 'cve':13A,16A 'develop':23B 'developer-tool':22B 'disallow':38B,71C 'featur':12A,48B,60B,85C 'filter':6A 'gain':66B 'incomplet':4A,35B,68C 'input':5A,39B,72C 'let':7A,41B 'list':36B,69C 'network':51B,88C 'protect':61B 'runtim':25B 'secur':11A,47B,84C 'sourc':53B 'state':56B 'studio':2A,20A,28B,31B,75C 'tool':24B 'unauthor':43B,79C 'visual':1A,19A,27B,30B,74C 'visual-studio-cod':26B","nicknames":[],"mitigations":[],"who_affected":"Teams that run Visual Studio Code, including remote or tunnelled setups where the editor is reachable over a network, are the likely exposure. The sources do not say which configuration or feature is needed to reach the bypass, so whether a given install is affected is unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":["studiocode","visualstudiocode"],"ptokens":["code","studio","visual"],"labels":["developertools","high","runtime","vendor","visualstudiocode"],"campaign_type":null,"search_a":"'-121663':15A,18A '-2026':14A,17A 'attack':8A 'bypass':9A 'code':3A,21A 'cve':13A,16A 'featur':12A 'filter':6A 'incomplet':4A 'input':5A 'let':7A 'secur':11A 'studio':2A,20A 'visual':1A,19A","search_b":"'attack':44B,65B 'beyond':67B 'bypass':45B,59B 'code':29B,32B 'develop':23B 'developer-tool':22B 'disallow':38B 'featur':48B,60B 'gain':66B 'incomplet':35B 'input':39B 'let':41B 'list':36B 'network':51B 'protect':61B 'runtim':25B 'secur':47B 'sourc':53B 'state':56B 'studio':28B,31B 'tool':24B 'unauthor':43B 'visual':27B,30B 'visual-studio-cod':26B","search_c":"'allow':77C 'attack':80C 'bypass':82C 'code':76C 'disallow':71C 'featur':85C 'incomplet':68C 'input':72C 'list':69C 'network':88C 'secur':84C 'studio':75C 'unauthor':79C 'visual':74C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:29+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121663","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121663","severity":null,"published_at":"2026-11-10T19:20:29+00:00","modified_at":"2026-11-10T19:20:29+00:00","first_seen_at":"2026-11-10T19:25:08+00:00","fetched_at":"2026-11-10T19:25:08+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"}