{"id":"CVE-2026-122138","kind":"vulnerability","aliases":["CVE-2026-122138"],"related":[],"title":"BlueprintUE: login rate limit bypass lets attackers brute-force passwords","description":"BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 contains a login rate limit bypass vulnerability in LoginMiddleware.php that keys failed-login counters on case-sensitive usernames. Unauthenticated attackers can vary username casing against case-insensitive MySQL lookups to get extra attempts and brute-force passwords past the per-account lockout.","summary":"BlueprintUE Self-Hosted Edition before 4.3.4 counts failed logins per case-sensitive username, while MySQL matches usernames case-insensitively. An unauthenticated attacker can vary username casing to get extra attempts and brute-force passwords past the per-account lockout.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["blueprintue","mysql","package","php","self-hosted"],"not_affected_if":["managed-hosting","not-self-hosted"],"how_to_check":"- Check the installed BlueprintUE Self-Hosted Edition version; affected versions are `4.2.0` before `4.3.4`.\n- Review `LoginMiddleware.php` for how failed-login counters are keyed.","fix":"- BlueprintUE Self-Hosted Edition: upgrade to `4.3.4` or later (per the NVD description).","status":"open","published_at":"2026-11-04T21:18:10+00:00","first_seen_at":"2026-11-04T21:49:20+00:00","triaged_at":"2026-11-04T21:51:14+00:00","updated_at":"2026-11-04T21:51:14+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-04T21:51:14Z","model":"claude-haiku-5-5","output":{"fix":"- BlueprintUE Self-Hosted Edition: upgrade to `4.3.4` or later (per the NVD description).","reach":"network","title":"BlueprintUE: login rate limit bypass lets attackers brute-force passwords","impact":"high","summary":"BlueprintUE Self-Hosted Edition before 4.3.4 counts failed logins per case-sensitive username, while MySQL matches usernames case-insensitively. An unauthenticated attacker can vary username casing to get extra attempts and brute-force passwords past the per-account lockout.","audience":"businesses","category":"package","nicknames":[],"who_cares":["blueprintue","self-hosted","php","mysql"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"attacker brute-forces user passwords and gets account access","analyst_note":"Confirm the fixed version and whether the MySQL case-insensitive collation is required, using the linked vendor advisory and release notes.","how_to_check":"- Check the installed BlueprintUE Self-Hosted Edition version; affected versions are `4.2.0` before `4.3.4`.\n- Review `LoginMiddleware.php` for how failed-login counters are keyed.","plain_action":"","needs_analyst":true,"not_affected_if":["managed-hosting","not-self-hosted"],"who_is_affected":"Teams running BlueprintUE Self-Hosted Edition from 4.2.0 up to but not including 4.3.4 with a MySQL backend, where login is reachable from the internet or the network. Hosted BlueprintUE instances are not the vendor's self-hosted edition and are not covered by this entry, so unknown for them.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000735,"input_tokens":4237,"output_tokens":623,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-122138':14A,17A '-2026':13A,16A '4.2.0':74C '4.3.4':31B,76C 'account':67B,122C 'attack':7A,49B,98C 'attempt':57B,112C 'blueprintu':1A,18B,25B,69C 'brute':9A,60B,115C 'brute-forc':8A,59B,114C 'bypass':5A,82C 'case':37B,45B,53B,94C,102C,105C 'case-insensit':44B,104C 'case-sensit':36B,93C 'contain':77C 'count':32B 'counter':91C 'cve':12A,15A 'edit':29B,73C 'extra':56B,111C 'fail':33B,89C 'failed-login':88C 'forc':10A,61B,116C 'get':55B,110C 'host':24B,28B,72C 'insensit':46B,106C 'key':87C 'let':6A 'limit':4A,81C 'lockout':68B,123C 'login':2A,34B,79C,90C 'loginmiddleware.php':85C 'lookup':108C 'match':42B 'mysql':19B,41B,107C 'packag':20B 'password':11A,62B,117C 'past':63B,118C 'per':35B,66B,121C 'per-account':65B,120C 'php':21B 'rate':3A,80C 'self':23B,27B,71C 'self-host':22B,26B,70C 'sensit':38B,95C 'unauthent':48B,97C 'usernam':39B,43B,52B,96C,101C 'vari':51B,100C 'vulner':83C","nicknames":[],"mitigations":[],"who_affected":"Teams running BlueprintUE Self-Hosted Edition from 4.2.0 up to but not including 4.3.4 with a MySQL backend, where login is reachable from the internet or the network. Hosted BlueprintUE instances are not the vendor's self-hosted edition and are not covered by this entry, so unknown for them.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["blueprintue","medium","mysql","package","php","selfhosted"],"campaign_type":null,"first_public_at":"2026-11-04T14:28:24+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/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-2026-122138","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122138","severity":null,"published_at":"2026-11-04T21:18:10+00:00","modified_at":"2026-11-04T21:18:10+00:00","first_seen_at":"2026-11-04T21:49:20+00:00","fetched_at":"2026-11-04T21:49:20+00:00","note":null}],"documents":[{"id":61690,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/releases/tag/v4.3.4","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":70678,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/security/advisories/GHSA-773r-585g-6vc3","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-11-04T14:28:24+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":70679,"url":"https://www.vulncheck.com/advisories/blueprintue-self-hosted-edition-4.2.0-before-4.3.4-login-rate-limit-bypass","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"},{"id":70676,"url":"https://github.com/blueprintue/blueprintue-self-hosted-edition/commit/bd4af38d2f7d499be23fc4106f93980a1348ddd7","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"}],"exploit_sources":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}