{"id":"CVE-2026-123304","kind":"vulnerability","aliases":["CVE-2026-123304"],"related":[],"title":"JetBrains IntelliJ IDEA: opening untrusted projects can run code via ShellCheck path","description":"In JetBrains IntelliJ IDEA before 2026.3 code execution in untrusted projects via a configured ShellCheck path","summary":"In JetBrains IntelliJ IDEA before 2026.3, a project can configure a ShellCheck path that the IDE executes, so opening an untrusted project can run code on the developer's machine. An attacker who supplies a malicious project gets code execution as the developer's user.","severity":"high","cvss":7.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["developer-tools","intellij-idea","jetbrains","package"],"not_affected_if":["trusted-projects-only","version-2026.3-or-later"],"how_to_check":"- Check the IntelliJ IDEA version under Help > About, or run `idea --version` where the CLI launcher is installed.\n- Look for IDEA versions below `2026.3` on developer machines.\n- Review whether the ShellCheck path is configured in any project you open.","fix":"- JetBrains IntelliJ IDEA: move to `2026.3` or later (fixed version per the description).","status":"open","published_at":"2026-11-06T11:17:09+00:00","first_seen_at":"2026-11-06T11:41:25+00:00","triaged_at":"2026-11-06T11:41:58+00:00","updated_at":"2026-11-06T11:41:58+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-06T11:41:58Z","model":"claude-haiku-5-5","output":{"fix":"- JetBrains IntelliJ IDEA: move to `2026.3` or later (fixed version per the description).","reach":"local","title":"JetBrains IntelliJ IDEA: opening untrusted projects can run code via ShellCheck path","impact":"high","summary":"In JetBrains IntelliJ IDEA before 2026.3, a project can configure a ShellCheck path that the IDE executes, so opening an untrusted project can run code on the developer's machine. An attacker who supplies a malicious project gets code execution as the developer's user.","audience":"developers","category":"package","nicknames":[],"who_cares":["intellij-idea","jetbrains","developer-tools"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Code runs as the developer's user on their machine","analyst_note":"Confirm whether opening a project alone triggers execution or a trust prompt applies, using the NVD entry and JetBrains advisory.","how_to_check":"- Check the IntelliJ IDEA version under Help > About, or run `idea --version` where the CLI launcher is installed.\n- Look for IDEA versions below `2026.3` on developer machines.\n- Review whether the ShellCheck path is configured in any project you open.","plain_action":"","needs_analyst":true,"not_affected_if":["trusted-projects-only","version-2026.3-or-later"],"who_is_affected":"Developers who open projects from untrusted sources in IntelliJ IDEA versions before 2026.3 are exposed, because a configured ShellCheck path runs when the project is opened. Teams that only open their own trusted repositories have lower exposure but should still update. Whether the flaw needs a user action beyond opening the project is unknown.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000733,"input_tokens":4175,"output_tokens":632,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123304':15A,18A '-2026':14A,17A '2026.3':32B,77C 'attack':58B 'code':9A,51B,65B,78C 'configur':36B,85C 'cve':13A,16A 'develop':20B,54B,69B 'developer-tool':19B 'execut':43B,66B,79C 'get':64B 'ide':42B 'idea':3A,24B,30B,75C 'intellij':2A,23B,29B,74C 'intellij-idea':22B 'jetbrain':1A,25B,28B,73C 'machin':56B 'malici':62B 'open':4A,45B 'packag':26B 'path':12A,39B,87C 'project':6A,34B,48B,63B,82C 'run':8A,50B 'shellcheck':11A,38B,86C 'suppli':60B 'tool':21B 'untrust':5A,47B,81C 'user':71B 'via':10A,83C","nicknames":[],"mitigations":[],"who_affected":"Developers who open projects from untrusted sources in IntelliJ IDEA versions before 2026.3 are exposed, because a configured ShellCheck path runs when the project is opened. Teams that only open their own trusted repositories have lower exposure but should still update. Whether the flaw needs a user action beyond opening the project is unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["developertools","high","intellijidea","jetbrains","package"],"campaign_type":null,"search_a":"'-123304':15A,18A '-2026':14A,17A 'code':9A 'cve':13A,16A 'idea':3A 'intellij':2A 'jetbrain':1A 'open':4A 'path':12A 'project':6A 'run':8A 'shellcheck':11A 'untrust':5A 'via':10A","search_b":"'2026.3':32B 'attack':58B 'code':51B,65B 'configur':36B 'develop':20B,54B,69B 'developer-tool':19B 'execut':43B,66B 'get':64B 'ide':42B 'idea':24B,30B 'intellij':23B,29B 'intellij-idea':22B 'jetbrain':25B,28B 'machin':56B 'malici':62B 'open':45B 'packag':26B 'path':39B 'project':34B,48B,63B 'run':50B 'shellcheck':38B 'suppli':60B 'tool':21B 'untrust':47B 'user':71B","search_c":"'2026.3':77C 'code':78C 'configur':85C 'execut':79C 'idea':75C 'intellij':74C 'jetbrain':73C 'path':87C 'project':82C 'shellcheck':86C 'untrust':81C 'via':83C","first_public_at":"2026-11-06T11:17:09+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"cve@jetbrains.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123304","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123304","severity":null,"published_at":"2026-11-06T11:17:09+00:00","modified_at":"2026-11-06T11:17:09+00:00","first_seen_at":"2026-11-06T11:41:25+00:00","fetched_at":"2026-11-06T11:41:25+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"}