{"id":"CVE-2026-109873","kind":"vulnerability","aliases":["CVE-2026-109873"],"related":[],"title":"WordPress User Registration & Membership plugin: unpaid users can log in","description":"The User Registration & Membership  WordPress plugin before 5.3.2 does not enforce its payment-before-login restriction when a registration is submitted without a membership selection, allowing unauthenticated users to create an account on a payment-gated registration form and log in without completing payment.","summary":"The User Registration & Membership WordPress plugin before 5.3.2 skips its payment check when a registration is submitted without choosing a membership. An unauthenticated visitor can create an account on a payment-gated form and log in without paying.","severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["membership-sites","package","user-registration-membership","wordpress"],"not_affected_if":["no-payment-gated-forms","plugin-version-5.3.2-or-later"],"how_to_check":"- Look for the User Registration & Membership plugin in the WordPress admin plugin list and check its version.\n- Confirm whether any registration forms require payment before login.","fix":"- User Registration & Membership plugin: `5.3.2` or later","status":"open","published_at":"2026-11-11T06:17:11+00:00","first_seen_at":"2026-11-11T06:25:40+00:00","triaged_at":"2026-11-11T06:27:59+00:00","updated_at":"2026-11-11T06:27:59+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-11T06:27:59Z","model":"claude-haiku-5-5","output":{"fix":"- User Registration & Membership plugin: `5.3.2` or later\n- unknown","reach":"internet","title":"WordPress User Registration & Membership plugin: unpaid users can log in","impact":"medium","summary":"The User Registration & Membership WordPress plugin before 5.3.2 skips its payment check when a registration is submitted without choosing a membership. An unauthenticated visitor can create an account on a payment-gated form and log in without paying.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","membership-sites","user-registration-membership"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"unpaid users gain logged-in access to paid membership content","analyst_note":"Confirm the affected form configuration and whether the 5.3.2 fix is the only remediation, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-109873.","how_to_check":"- Look for the User Registration & Membership plugin in the WordPress admin plugin list and check its version.\n- Confirm whether any registration forms require payment before login.\n- unknown","plain_action":"","product_name":"","needs_analyst":true,"not_affected_if":["plugin-version-5.3.2-or-later","no-payment-gated-forms"],"who_is_affected":"Sites running the User Registration & Membership WordPress plugin before 5.3.2 that use payment-gated registration forms are exposed. Sites without payment-gated membership forms, or without this plugin, can skip it. The sources do not say whether the flaw needs a particular form configuration to trigger.","user_interaction":"no","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000751,"input_tokens":4533,"output_tokens":595,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-109873':12A,15A '-2026':11A,14A '5.3.2':32B,71C 'account':52B,96C 'allow':90C 'check':36B 'choos':43B 'complet':108C 'creat':50B,94C 'cve':10A,13A 'enforc':74C 'form':58B,103C 'gate':57B,101C 'log':9A,60B,105C 'login':79C 'membership':4A,17B,23B,28B,45B,67C,88C 'membership-sit':16B 'packag':19B 'pay':63B 'payment':35B,56B,77C,100C,109C 'payment-before-login':76C 'payment-g':55B,99C 'plugin':5A,30B,69C 'registr':3A,22B,27B,39B,66C,83C,102C 'restrict':80C 'select':89C 'site':18B 'skip':33B 'submit':41B,85C 'unauthent':47B,91C 'unpaid':6A 'user':2A,7A,21B,26B,65C,92C 'user-registration-membership':20B 'visitor':48B 'without':42B,62B,86C,107C 'wordpress':1A,24B,29B,68C","nicknames":[],"mitigations":[],"who_affected":"Sites running the User Registration & Membership WordPress plugin before 5.3.2 that use payment-gated registration forms are exposed. Sites without payment-gated membership forms, or without this plugin, can skip it. The sources do not say whether the flaw needs a particular form configuration to trigger.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","membershipsites","package","userregistrationmembership","wordpress"],"campaign_type":null,"search_a":"'-109873':12A,15A '-2026':11A,14A 'cve':10A,13A 'log':9A 'membership':4A 'plugin':5A 'registr':3A 'unpaid':6A 'user':2A,7A 'wordpress':1A","search_b":"'5.3.2':32B 'account':52B 'check':36B 'choos':43B 'creat':50B 'form':58B 'gate':57B 'log':60B 'membership':17B,23B,28B,45B 'membership-sit':16B 'packag':19B 'pay':63B 'payment':35B,56B 'payment-g':55B 'plugin':30B 'registr':22B,27B,39B 'site':18B 'skip':33B 'submit':41B 'unauthent':47B 'user':21B,26B 'user-registration-membership':20B 'visitor':48B 'without':42B,62B 'wordpress':24B,29B","search_c":"'5.3.2':71C 'account':96C 'allow':90C 'complet':108C 'creat':94C 'enforc':74C 'form':103C 'gate':101C 'log':105C 'login':79C 'membership':67C,88C 'payment':77C,100C,109C 'payment-before-login':76C 'payment-g':99C 'plugin':69C 'registr':66C,83C,102C 'restrict':80C 'select':89C 'submit':85C 'unauthent':91C 'user':65C,92C 'without':86C,107C 'wordpress':68C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-11T06:17:11+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-109873","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109873","severity":null,"published_at":"2026-11-11T06:17:11+00:00","modified_at":"2026-11-11T06:17:11+00:00","first_seen_at":"2026-11-11T06:25:40+00:00","fetched_at":"2026-11-11T06:25:40+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}