{"id":"CVE-2026-123320","kind":"vulnerability","aliases":["CVE-2026-123320"],"related":[],"title":"JetBrains Toolbox App: login dialog lets users connect to malicious servers","description":"In JetBrains Toolbox App before 3.9 insufficient warning in the login dialog allowed connecting to a malicious server","summary":"JetBrains Toolbox App before 3.9 showed insufficient warning in its login dialog, so a user could connect to a server controlled by an attacker. The sources do not describe what data or actions the attacker gets after the connection.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["developer-tools","jetbrains","other","toolbox-app"],"not_affected_if":["version-3.9-or-later"],"how_to_check":"- Check the installed Toolbox App version in its About dialog; the sources do not give a command.","fix":"- JetBrains Toolbox App: move to `3.9` or later (per the product range before 3.9).","status":"open","published_at":"2026-11-06T11:17:11+00:00","first_seen_at":"2026-11-06T11:41:26+00:00","triaged_at":"2026-11-06T11:43:53+00:00","updated_at":"2026-11-06T11:43:53+00:00","category":"other","confidence":0.5,"triage":{"at":"2026-11-06T11:43:53Z","model":"claude-haiku-5-5","output":{"fix":"- JetBrains Toolbox App: move to `3.9` or later (per the product range before 3.9).","reach":"unknown","title":"JetBrains Toolbox App: login dialog lets users connect to malicious servers","impact":"low","summary":"JetBrains Toolbox App before 3.9 showed insufficient warning in its login dialog, so a user could connect to a server controlled by an attacker. The sources do not describe what data or actions the attacker gets after the connection.","audience":"developers","category":"other","nicknames":[],"who_cares":["jetbrains","toolbox-app","developer-tools"],"confidence":0.5,"fix_status":"available","needs_auth":"no","worst_case":"unknown; the user connects to an attacker-controlled server","analyst_note":"","how_to_check":"- Check the installed Toolbox App version in its About dialog; the sources do not give a command.\n- unknown","plain_action":"","needs_analyst":false,"not_affected_if":["version-3.9-or-later"],"who_is_affected":"Developers who sign in to a JetBrains Toolbox App server through its login dialog are the ones exposed, since the warning about the server was insufficient. The sources do not say whether managed or self-hosted setups differ. Anyone already on 3.9 or later is not affected.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000658,"input_tokens":4171,"output_tokens":482,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-123320':14A,17A '-2026':13A,16A '3.9':30B,70C 'action':58B 'allow':77C 'app':3A,25B,28B,68C 'attack':49B,60B 'connect':8A,42B,64B,78C 'control':46B 'could':41B 'cve':12A,15A 'data':56B 'describ':54B 'develop':19B 'developer-tool':18B 'dialog':5A,37B,76C 'get':61B 'insuffici':32B,71C 'jetbrain':1A,21B,26B,66C 'let':6A 'login':4A,36B,75C 'malici':10A,81C 'server':11A,45B,82C 'show':31B 'sourc':51B 'tool':20B 'toolbox':2A,24B,27B,67C 'toolbox-app':23B 'user':7A,40B 'warn':33B,72C","nicknames":[],"mitigations":[],"who_affected":"Developers who sign in to a JetBrains Toolbox App server through its login dialog are the ones exposed, since the warning about the server was insufficient. The sources do not say whether managed or self-hosted setups differ. Anyone already on 3.9 or later is not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["developertools","jetbrains","low","other","toolboxapp"],"campaign_type":null,"search_a":"'-123320':14A,17A '-2026':13A,16A 'app':3A 'connect':8A 'cve':12A,15A 'dialog':5A 'jetbrain':1A 'let':6A 'login':4A 'malici':10A 'server':11A 'toolbox':2A 'user':7A","search_b":"'3.9':30B 'action':58B 'app':25B,28B 'attack':49B,60B 'connect':42B,64B 'control':46B 'could':41B 'data':56B 'describ':54B 'develop':19B 'developer-tool':18B 'dialog':37B 'get':61B 'insuffici':32B 'jetbrain':21B,26B 'login':36B 'server':45B 'show':31B 'sourc':51B 'tool':20B 'toolbox':24B,27B 'toolbox-app':23B 'user':40B 'warn':33B","search_c":"'3.9':70C 'allow':77C 'app':68C 'connect':78C 'dialog':76C 'insuffici':71C 'jetbrain':66C 'login':75C 'malici':81C 'server':82C 'toolbox':67C 'warn':72C","first_public_at":"2026-11-06T11:17:11+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N","cvss_by":"cve@jetbrains.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123320","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123320","severity":null,"published_at":"2026-11-06T11:17:11+00:00","modified_at":"2026-11-06T11:17:11+00:00","first_seen_at":"2026-11-06T11:41:26+00:00","fetched_at":"2026-11-06T11:41:26+00:00","note":null}],"documents":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}