{"id":"CVE-2026-85287","kind":"vulnerability","aliases":["CVE-2026-85287"],"related":[],"title":"HomeBox: case-variant email registration can lock out existing users","description":"HomeBox is a home inventory and organization system. Prior to 0.27.0, POST /api/v1/users/register and the users.email uniqueness constraint treat email addresses as case-sensitive while HomeBox uses a case-insensitive login lookup. An unauthenticated attacker who knows a victim's email can register a differently cased variant, creating duplicate rows that cause login to return 401 for both variants and deny the victim access, while also bypassing the one-account-per-email policy. This issue is fixed in version 0.27.0.","summary":"HomeBox, a self-hosted home inventory app, treats email addresses as case-sensitive at registration but case-insensitive at login. An unauthenticated attacker who knows a victim's email can register a differently cased copy, which makes login fail for the victim and bypasses the one-account-per-email rule.","severity":"medium","cvss":6.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["homebox","package","self-hosted"],"not_affected_if":["registration-disabled","version-0.27.0-or-later"],"how_to_check":"- Check the HomeBox version in use; versions below `0.27.0` are affected.\n- Review the users table for duplicate email addresses that differ only in letter case.","fix":"- HomeBox: upgrade to `0.27.0`.","status":"open","published_at":"2026-11-05T17:18:22+00:00","first_seen_at":"2026-11-05T17:40:05+00:00","triaged_at":"2026-11-05T17:42:33+00:00","updated_at":"2026-11-05T17:42:33+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-05T17:42:33Z","model":"claude-haiku-5-5","output":{"fix":"- HomeBox: upgrade to `0.27.0`.","reach":"internet","title":"HomeBox: case-variant email registration can lock out existing users","impact":"low","summary":"HomeBox, a self-hosted home inventory app, treats email addresses as case-sensitive at registration but case-insensitive at login. An unauthenticated attacker who knows a victim's email can register a differently cased copy, which makes login fail for the victim and bypasses the one-account-per-email rule.","audience":"businesses","category":"package","nicknames":[],"who_cares":["self-hosted","homebox"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Existing user locked out of their account by a duplicate registration","analyst_note":"","how_to_check":"- Check the HomeBox version in use; versions below `0.27.0` are affected.\n- Review the users table for duplicate email addresses that differ only in letter case.","plain_action":"","needs_analyst":false,"not_affected_if":["version-0.27.0-or-later","registration-disabled"],"who_is_affected":"Any HomeBox instance before 0.27.0 that allows open registration through POST /api/v1/users/register is exposed. Instances with registration closed or managed only by an admin are not reachable this way, and single-user setups with no public access carry little risk.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000681,"input_tokens":4319,"output_tokens":498,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-85287':14A,17A '/api/v1/users/register':89C '0.27.0':87C,159C '401':134C 'access':142C 'account':73B,149C 'address':33B,97C 'also':144C 'app':30B 'attack':48B,113C 'bypass':69B,145C 'case':3A,36B,42B,59B,100C,107C,124C 'case-insensit':41B,106C 'case-sensit':35B,99C 'case-vari':2A 'caus':130C 'constraint':94C 'copi':60B 'creat':126C 'cve':12A,15A 'deni':139C 'differ':58B,123C 'duplic':127C 'email':5A,32B,54B,75B,96C,119C,151C 'exist':10A 'fail':64B 'fix':156C 'home':28B,80C 'homebox':1A,18B,23B,77C,103C 'host':22B,27B 'insensit':43B,108C 'inventori':29B,81C 'issu':154C 'know':50B,115C 'lock':8A 'login':45B,63B,109C,131C 'lookup':110C 'make':62B 'one':72B,148C 'one-account-per-email':71B,147C 'organ':83C 'packag':19B 'per':74B,150C 'polici':152C 'post':88C 'prior':85C 'regist':56B,121C 'registr':6A,39B 'return':133C 'row':128C 'rule':76B 'self':21B,26B 'self-host':20B,25B 'sensit':37B,101C 'system':84C 'treat':31B,95C 'unauthent':47B,112C 'uniqu':93C 'use':104C 'user':11A 'users.email':92C 'variant':4A,125C,137C 'version':158C 'victim':52B,67B,117C,141C","nicknames":[],"mitigations":[],"who_affected":"Any HomeBox instance before 0.27.0 that allows open registration through POST /api/v1/users/register is exposed. Instances with registration closed or managed only by an admin are not reachable this way, and single-user setups with no public access carry little risk.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["homebox","medium","package","selfhosted"],"campaign_type":null,"first_public_at":"2026-10-17T16:16:38+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","cvss_by":"security-advisories@github.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-85287","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85287","severity":null,"published_at":"2026-11-05T17:18:22+00:00","modified_at":"2026-11-05T17:18:22+00:00","first_seen_at":"2026-11-05T17:40:05+00:00","fetched_at":"2026-11-05T17:40:05+00:00","note":null}],"documents":[{"id":78139,"url":"https://github.com/sysadminsmedia/homebox/commit/fbf8c8505b47c3d46aa6c17f7c657906b5b1b83a","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":48316,"url":"https://github.com/sysadminsmedia/homebox/releases/tag/v0.27.0","title":"Release notes: github.com","kind":"release","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Release notes: github.com"},{"id":78141,"url":"https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-xqg9-6xxv-3452","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-17T16:16:38+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.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"}