{"id":"CVE-2026-123619","kind":"vulnerability","aliases":["CVE-2026-123619"],"related":[],"title":"Lektor: Windows admin API path traversal lets attackers delete or write files","description":"Lektor through 3.3.14 and 3.4.0b15 contains an absolute path traversal vulnerability in the admin API on Windows that allows attackers to escape the project directory by supplying drive-letter paths that cleanup_path does not normalise. Attackers can use a malicious web page with cross-site requests or DNS rebinding against the unauthenticated local server to recursively delete directories via deleterecord or write attacker-controlled files via newattachment.","summary":"Lektor's local admin API on Windows does not normalise drive-letter paths, so requests can escape the project directory. A malicious web page visited by a developer can use cross-site requests or DNS rebinding to recursively delete directories or write attacker-chosen files.","severity":"medium","cvss":6.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["lektor","package","python","windows"],"not_affected_if":["admin-server-not-running","non-windows"],"how_to_check":"- Check whether the Lektor version is `3.3.14` or earlier, or `3.4.0b15`, with `lektor --version`\n- Check whether the local admin server is running on Windows while a project is open in the Lektor admin interface","fix":null,"status":"open","published_at":"2026-11-06T15:17:19+00:00","first_seen_at":"2026-11-06T15:42:44+00:00","triaged_at":"2026-11-06T15:44:28+00:00","updated_at":"2026-11-06T15:44:28+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-06T15:44:28Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"local","title":"Lektor: Windows admin API path traversal lets attackers delete or write files","impact":"high","summary":"Lektor's local admin API on Windows does not normalise drive-letter paths, so requests can escape the project directory. A malicious web page visited by a developer can use cross-site requests or DNS rebinding to recursively delete directories or write attacker-chosen files.","audience":"developers","category":"package","nicknames":[],"who_cares":["lektor","windows","python"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker recursively deletes directories or writes arbitrary files on the developer's machine","analyst_note":"Confirm the fixed version and whether a patch exists; the sources give only the affected ranges and a third-party advisory at www.vulncheck.com.","how_to_check":"- Check whether the Lektor version is `3.3.14` or earlier, or `3.4.0b15`, with `lektor --version`\n- Check whether the local admin server is running on Windows while a project is open in the Lektor admin interface","plain_action":"","needs_analyst":true,"not_affected_if":["non-windows","admin-server-not-running"],"who_is_affected":"Affects developers running the Lektor static site generator's local admin server on Windows. The admin API is unauthenticated, so exposure comes from a developer browsing a malicious page while the server runs. Systems not running Lektor's admin server on Windows are not affected.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"medium"},"cost_usd":0.000706,"input_tokens":4306,"output_tokens":550,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123619':15A,18A '-2026':14A,17A '3.3.14':73C '3.4.0':75C 'absolut':79C 'admin':3A,26B,85C 'allow':90C 'api':4A,27B,86C 'attack':8A,68B,91C,109C,138C 'attacker-chosen':67B 'attacker-control':137C 'b15':76C 'chosen':69B 'cleanup':104C 'contain':77C 'control':139C 'cross':55B,118C 'cross-sit':54B,117C 'cve':13A,16A 'delet':9A,63B,131C 'deleterecord':134C 'develop':51B 'directori':43B,64B,96C,132C 'dns':59B,122C 'drive':34B,100C 'drive-lett':33B,99C 'escap':40B,93C 'file':12A,70B,140C 'lektor':1A,19B,23B,71C 'let':7A 'letter':35B,101C 'local':25B,127C 'malici':45B,113C 'newattach':142C 'normalis':32B,108C 'packag':20B 'page':47B,115C 'path':5A,36B,80C,102C,105C 'project':42B,95C 'python':21B 'rebind':60B,123C 'recurs':62B,130C 'request':38B,57B,120C 'server':128C 'site':56B,119C 'suppli':98C 'travers':6A,81C 'unauthent':126C 'use':53B,111C 'via':133C,141C 'visit':48B 'vulner':82C 'web':46B,114C 'window':2A,22B,29B,88C 'write':11A,66B,136C","nicknames":[],"mitigations":[],"who_affected":"Affects developers running the Lektor static site generator's local admin server on Windows. The admin API is unauthenticated, so exposure comes from a developer browsing a malicious page while the server runs. Systems not running Lektor's admin server on Windows are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["lektor","medium","package","python","windows"],"campaign_type":null,"search_a":"'-123619':15A,18A '-2026':14A,17A 'admin':3A 'api':4A 'attack':8A 'cve':13A,16A 'delet':9A 'file':12A 'lektor':1A 'let':7A 'path':5A 'travers':6A 'window':2A 'write':11A","search_b":"'admin':26B 'api':27B 'attack':68B 'attacker-chosen':67B 'chosen':69B 'cross':55B 'cross-sit':54B 'delet':63B 'develop':51B 'directori':43B,64B 'dns':59B 'drive':34B 'drive-lett':33B 'escap':40B 'file':70B 'lektor':19B,23B 'letter':35B 'local':25B 'malici':45B 'normalis':32B 'packag':20B 'page':47B 'path':36B 'project':42B 'python':21B 'rebind':60B 'recurs':62B 'request':38B,57B 'site':56B 'use':53B 'visit':48B 'web':46B 'window':22B,29B 'write':66B","search_c":"'3.3.14':73C '3.4.0':75C 'absolut':79C 'admin':85C 'allow':90C 'api':86C 'attack':91C,109C,138C 'attacker-control':137C 'b15':76C 'cleanup':104C 'contain':77C 'control':139C 'cross':118C 'cross-sit':117C 'delet':131C 'deleterecord':134C 'directori':96C,132C 'dns':122C 'drive':100C 'drive-lett':99C 'escap':93C 'file':140C 'lektor':71C 'letter':101C 'local':127C 'malici':113C 'newattach':142C 'normalis':108C 'page':115C 'path':80C,102C,105C 'project':95C 'rebind':123C 'recurs':130C 'request':120C 'server':128C 'site':119C 'suppli':98C 'travers':81C 'unauthent':126C 'use':111C 'via':133C,141C 'vulner':82C 'web':114C 'window':88C 'write':136C","first_public_at":"2026-11-06T15:17:19+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123619","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123619","severity":null,"published_at":"2026-11-06T15:17:19+00:00","modified_at":"2026-11-06T15:17:19+00:00","first_seen_at":"2026-11-06T15:42:44+00:00","fetched_at":"2026-11-06T15:42:44+00:00","note":null}],"documents":[{"id":87574,"url":"https://www.vulncheck.com/advisories/lektor-through-3.3.14-and-3.4-0b15-path-traversal-via-admin-api-drive-letter-paths","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}