{"id":"CVE-2026-121664","kind":"vulnerability","aliases":["CVE-2026-121664"],"related":[],"title":"Visual Studio Code: cross-site scripting lets an attacker run code over network","description":"Improper neutralization of input during web page generation ('cross-site scripting') in Visual Studio Code allows an unauthorized attacker to execute code over a network.","summary":"Visual Studio Code mishandles input when generating web pages, which is a cross-site scripting flaw. A remote attacker who gets a crafted input in front of the editor can run code.","severity":"high","cvss":8.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["developers","other","visual-studio-code"],"not_affected_if":[],"how_to_check":"- Check the installed Visual Studio Code version via Help > About, or `code --version`","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":"2026-11-10T19:34:27+00:00","updated_at":"2026-11-10T19:34:27+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-10T19:34:27Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Visual Studio Code: cross-site scripting lets an attacker run code over network","impact":"high","summary":"Visual Studio Code mishandles input when generating web pages, which is a cross-site scripting flaw. A remote attacker who gets a crafted input in front of the editor can run code.","audience":"developers","category":"other","nicknames":[],"who_cares":["visual-studio-code","developers"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker runs code in the editor over the network","analyst_note":"Find the affected Visual Studio Code version ranges, fixed build, and the exact trigger in the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-121664 or the vendor advisory.","how_to_check":"- Check the installed Visual Studio Code version via Help > About, or `code --version`\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Developers who run Visual Studio Code and open content from untrusted sources may be exposed. The sources do not name affected version ranges or the exact trigger. unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000678,"input_tokens":4504,"output_tokens":455,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the affected Visual Studio Code version ranges, fixed build, and the exact trigger in the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-121664 or the vendor advisory.","search":"'-121664':17A,20A '-2026':16A,19A 'allow':76C 'attack':10A,46B,79C 'code':3A,12A,26B,29B,59B,75C,82C 'craft':50B 'cross':5A,40B,69C 'cross-sit':4A,39B,68C 'cve':15A,18A 'develop':21B 'editor':56B 'execut':81C 'flaw':43B 'front':53B 'generat':33B,67C 'get':48B 'improp':60C 'input':31B,51B,63C 'let':8A 'mishandl':30B 'network':14A,85C 'neutral':61C 'page':35B,66C 'remot':45B 'run':11A,58B 'script':7A,42B,71C 'site':6A,41B,70C 'studio':2A,25B,28B,74C 'unauthor':78C 'visual':1A,24B,27B,73C 'visual-studio-cod':23B 'web':34B,65C","nicknames":[],"mitigations":[],"who_affected":"Developers who run Visual Studio Code and open content from untrusted sources may be exposed. The sources do not name affected version ranges or the exact trigger. unknown","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["developers","high","other","visualstudiocode"],"campaign_type":null,"search_a":"'-121664':17A,20A '-2026':16A,19A 'attack':10A 'code':3A,12A 'cross':5A 'cross-sit':4A 'cve':15A,18A 'let':8A 'network':14A 'run':11A 'script':7A 'site':6A 'studio':2A 'visual':1A","search_b":"'attack':46B 'code':26B,29B,59B 'craft':50B 'cross':40B 'cross-sit':39B 'develop':21B 'editor':56B 'flaw':43B 'front':53B 'generat':33B 'get':48B 'input':31B,51B 'mishandl':30B 'page':35B 'remot':45B 'run':58B 'script':42B 'site':41B 'studio':25B,28B 'visual':24B,27B 'visual-studio-cod':23B 'web':34B","search_c":"'allow':76C 'attack':79C 'code':75C,82C 'cross':69C 'cross-sit':68C 'execut':81C 'generat':67C 'improp':60C 'input':63C 'network':85C 'neutral':61C 'page':66C 'script':71C 'site':70C 'studio':74C 'unauthor':78C 'visual':73C 'web':65C","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:H/PR:N/UI:R/S:C/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121664","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121664","severity":null,"published_at":"2026-11-10T19:20:29+00:00","modified_at":"2026-11-10T19:20:30+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"}