{"id":"CVE-2026-93766","kind":"vulnerability","aliases":["CVE-2026-93766"],"related":[],"title":"Happyforms Pro WordPress plugin: stored script injection via referer field","description":"The Happyforms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'happyforms_client_referer' parameter in all versions up to, and including, 1.38.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","summary":"The Happyforms Pro plugin for WordPress fails to sanitize the happyforms_client_referer parameter, so unauthenticated visitors can store scripts that run in pages. An attacker gets script execution in the browser of anyone who opens an affected page, including logged-in site administrators.","severity":"high","cvss":7.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["happyforms-pro","package","self-hosted","wordpress"],"not_affected_if":["newer-version","plugin-not-installed"],"how_to_check":"- Check the installed Happyforms Pro plugin version in the WordPress admin under Plugins; affected versions are all up to and including `1.38.9`.\n- Search form submission data and page content for unexpected script tags.","fix":"- Happyforms Pro: unknown; the sources do not state a fixed version.","status":"open","published_at":"2026-11-07T12:17:47+00:00","first_seen_at":"2026-11-07T12:47:09+00:00","triaged_at":"2026-11-07T12:48:44+00:00","updated_at":"2026-11-07T12:48:44+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-07T12:48:44Z","model":"claude-haiku-5-5","output":{"fix":"- Happyforms Pro: unknown; the sources do not state a fixed version.","reach":"internet","title":"Happyforms Pro WordPress plugin: stored script injection via referer field","impact":"medium","summary":"The Happyforms Pro plugin for WordPress fails to sanitize the happyforms_client_referer parameter, so unauthenticated visitors can store scripts that run in pages. An attacker gets script execution in the browser of anyone who opens an affected page, including logged-in site administrators.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","happyforms-pro","self-hosted"],"confidence":0.7,"fix_status":"unknown","needs_auth":"no","worst_case":"Scripts run in visitors' browsers, including administrators, on affected pages","analyst_note":"Confirm the first fixed version of Happyforms Pro, since the sources give none beyond the affected range ending at 1.38.9.","how_to_check":"- Check the installed Happyforms Pro plugin version in the WordPress admin under Plugins; affected versions are all up to and including `1.38.9`.\n- Search form submission data and page content for unexpected script tags.","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed","newer-version"],"who_is_affected":"Sites running the Happyforms Pro plugin for WordPress at version `1.38.9` or earlier are exposed. The flaw is reachable without an account through the form referer parameter, so any site using the plugin's forms should be reviewed. Sites without this plugin can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000721,"input_tokens":4263,"output_tokens":589,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-93766':13A,16A '1.38.9':97C 'access':126C 'administr':69B 'affect':62B 'anyon':58B 'arbitrari':115C 'attack':50B,112C 'browser':56B 'client':36B,87C 'cross':81C 'cross-sit':80C 'cve':11A,14A 'due':98C 'escap':105C 'execut':53B,122C 'fail':31B 'field':10A 'get':51B 'happyform':1A,18B,26B,35B,71C,86C 'happyforms-pro':17B 'host':23B 'includ':64B,96C 'inject':7A,114C,128C 'input':101C 'insuffici':100C 'log':66B 'logged-in':65B 'make':107C 'open':60B 'output':104C 'packag':20B 'page':48B,63B,119C,129C 'paramet':38B,89C 'plugin':4A,28B,73C 'possibl':109C 'pro':2A,19B,27B,72C 'refer':9A,37B,88C 'run':46B 'sanit':33B,102C 'script':6A,44B,52B,83C,117C 'self':22B 'self-host':21B 'site':68B,82C 'store':5A,43B,79C 'unauthent':40B,111C 'user':125C 'version':92C 'via':8A,84C 'visitor':41B 'vulner':77C 'web':116C 'whenev':123C 'wordpress':3A,24B,30B,75C","nicknames":[],"mitigations":[],"who_affected":"Sites running the Happyforms Pro plugin for WordPress at version `1.38.9` or earlier are exposed. The flaw is reachable without an account through the form referer parameter, so any site using the plugin's forms should be reviewed. Sites without this plugin can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["happyformspro","high","package","selfhosted","wordpress"],"campaign_type":null,"search_a":"'-2026':12A,15A '-93766':13A,16A 'cve':11A,14A 'field':10A 'happyform':1A 'inject':7A 'plugin':4A 'pro':2A 'refer':9A 'script':6A 'store':5A 'via':8A 'wordpress':3A","search_b":"'administr':69B 'affect':62B 'anyon':58B 'attack':50B 'browser':56B 'client':36B 'execut':53B 'fail':31B 'get':51B 'happyform':18B,26B,35B 'happyforms-pro':17B 'host':23B 'includ':64B 'log':66B 'logged-in':65B 'open':60B 'packag':20B 'page':48B,63B 'paramet':38B 'plugin':28B 'pro':19B,27B 'refer':37B 'run':46B 'sanit':33B 'script':44B,52B 'self':22B 'self-host':21B 'site':68B 'store':43B 'unauthent':40B 'visitor':41B 'wordpress':24B,30B","search_c":"'1.38.9':97C 'access':126C 'arbitrari':115C 'attack':112C 'client':87C 'cross':81C 'cross-sit':80C 'due':98C 'escap':105C 'execut':122C 'happyform':71C,86C 'includ':96C 'inject':114C,128C 'input':101C 'insuffici':100C 'make':107C 'output':104C 'page':119C,129C 'paramet':89C 'plugin':73C 'possibl':109C 'pro':72C 'refer':88C 'sanit':102C 'script':83C,117C 'site':82C 'store':79C 'unauthent':111C 'user':125C 'version':92C 'via':84C 'vulner':77C 'web':116C 'whenev':123C 'wordpress':75C","first_public_at":"2026-11-07T12:17:47+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-93766","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93766","severity":null,"published_at":"2026-11-07T12:17:47+00:00","modified_at":"2026-11-07T12:17:47+00:00","first_seen_at":"2026-11-07T12:47:09+00:00","fetched_at":"2026-11-07T12:47:09+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"}