{"id":"CVE-2026-123842","kind":"vulnerability","aliases":["CVE-2026-123842"],"related":[],"title":"JetBrains IntelliJ IDEA: symlinks in plugin archives let attackers write arbitrary files","description":"In JetBrains IntelliJ IDEA before 2026.3 arbitrary file write was possible via symlinks when extracting plugin archives","summary":"Before IntelliJ IDEA 2026.3, extracting a plugin archive could follow symlinks and write files outside the intended folder. An attacker who supplies a crafted plugin archive can overwrite files on the developer's machine.","severity":"high","cvss":7.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ide","intellij-idea","java","jetbrains","other"],"not_affected_if":["version-2026.3-or-later"],"how_to_check":"- Check the installed IntelliJ IDEA version under Help > About (fixed in 2026.3 per the sources)","fix":"- JetBrains IntelliJ IDEA: move to `2026.3` or later","status":"open","published_at":"2026-11-06T17:17:22+00:00","first_seen_at":"2026-11-06T17:43:13+00:00","triaged_at":"2026-11-06T17:45:10+00:00","updated_at":"2026-11-06T17:45:10+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-06T17:45:10Z","model":"claude-haiku-5-5","output":{"fix":"- JetBrains IntelliJ IDEA: move to `2026.3` or later","reach":"local","title":"JetBrains IntelliJ IDEA: symlinks in plugin archives let attackers write arbitrary files","impact":"high","summary":"Before IntelliJ IDEA 2026.3, extracting a plugin archive could follow symlinks and write files outside the intended folder. An attacker who supplies a crafted plugin archive can overwrite files on the developer's machine.","audience":"developers","category":"other","nicknames":[],"who_cares":["intellij-idea","jetbrains","java","ide"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"Arbitrary files written on the developer's machine via crafted plugin archive","analyst_note":"Check the JetBrains security advisory for the exact trigger, affected range and whether installing a plugin from an untrusted source is required.","how_to_check":"- Check the installed IntelliJ IDEA version under Help > About (fixed in 2026.3 per the sources)\n- unknown for other checks; the sources do not say","plain_action":"","needs_analyst":true,"not_affected_if":["version-2026.3-or-later"],"who_is_affected":"Developers running IntelliJ IDEA before 2026.3 who install plugin archives from untrusted sources. The sources do not give further detail on the exact trigger or whether a user must take a specific action.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000685,"input_tokens":4181,"output_tokens":534,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-123842':15A,18A '-2026':14A,17A '2026.3':28B,64C 'arbitrari':11A,65C 'archiv':7A,32B,50B,75C 'attack':9A,44B 'could':33B 'craft':48B 'cve':13A,16A 'develop':56B 'extract':29B,73C 'file':12A,38B,53B,66C 'folder':42B 'follow':34B 'ide':19B 'idea':3A,22B,27B,62C 'intellij':2A,21B,26B,61C 'intellij-idea':20B 'intend':41B 'java':23B 'jetbrain':1A,24B,60C 'let':8A 'machin':58B 'outsid':39B 'overwrit':52B 'plugin':6A,31B,49B,74C 'possibl':69C 'suppli':46B 'symlink':4A,35B,71C 'via':70C 'write':10A,37B,67C","nicknames":[],"mitigations":[],"who_affected":"Developers running IntelliJ IDEA before 2026.3 who install plugin archives from untrusted sources. The sources do not give further detail on the exact trigger or whether a user must take a specific action.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","ide","intellijidea","java","jetbrains","other"],"campaign_type":null,"search_a":"'-123842':15A,18A '-2026':14A,17A 'arbitrari':11A 'archiv':7A 'attack':9A 'cve':13A,16A 'file':12A 'idea':3A 'intellij':2A 'jetbrain':1A 'let':8A 'plugin':6A 'symlink':4A 'write':10A","search_b":"'2026.3':28B 'archiv':32B,50B 'attack':44B 'could':33B 'craft':48B 'develop':56B 'extract':29B 'file':38B,53B 'folder':42B 'follow':34B 'ide':19B 'idea':22B,27B 'intellij':21B,26B 'intellij-idea':20B 'intend':41B 'java':23B 'jetbrain':24B 'machin':58B 'outsid':39B 'overwrit':52B 'plugin':31B,49B 'suppli':46B 'symlink':35B 'write':37B","search_c":"'2026.3':64C 'arbitrari':65C 'archiv':75C 'extract':73C 'file':66C 'idea':62C 'intellij':61C 'jetbrain':60C 'plugin':74C 'possibl':69C 'symlink':71C 'via':70C 'write':67C","first_public_at":"2026-11-06T17:17:22+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H","cvss_by":"cve@jetbrains.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123842","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123842","severity":null,"published_at":"2026-11-06T17:17:22+00:00","modified_at":"2026-11-06T17:17:22+00:00","first_seen_at":"2026-11-06T17:43:13+00:00","fetched_at":"2026-11-06T17:43:13+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"}