{"id":"CVE-2026-93755","kind":"vulnerability","aliases":["CVE-2026-93755"],"related":[],"title":"Happyforms WordPress plugin: unauthenticated stored XSS through spoofed IP headers","description":"The Happyforms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via spoofable client IP headers in versions up to, and including, 1.38.9. This is due to the happyforms_get_client_ip() function reading raw HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR request headers without any validation or sanitization, storing the value as post meta ('client_ip') via update_post_meta() during unauthenticated form submissions, and later echoing it in the admin submission edit screen's Details metabox without output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user (typically an administrator reviewing a submission) accesses an injected page.","summary":"The Happyforms plugin for WordPress stores the client IP taken unvalidated from HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR headers on form submissions, then prints it unescaped in the admin submission screen. An unauthenticated attacker can plant script that runs in the browser of an administrator who opens the submission.","severity":"high","cvss":7.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["happyforms","package","self-hosted","wordpress"],"not_affected_if":["no-public-forms","plugin-not-installed"],"how_to_check":"- Check whether the Happyforms plugin is installed and its version is `1.38.9` or lower in the WordPress admin plugin list\n- Look for the `happyforms_get_client_ip` function in the plugin's source files","fix":"- Happyforms plugin: unknown (the sources do not name 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":"2026-11-07T12:48:45+00:00","updated_at":"2026-11-07T12:48:45+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-07T12:48:45Z","model":"claude-haiku-5-5","output":{"fix":"- Happyforms plugin: unknown (the sources do not name a fixed version)","reach":"internet","title":"Happyforms WordPress plugin: unauthenticated stored XSS through spoofed IP headers","impact":"medium","summary":"The Happyforms plugin for WordPress stores the client IP taken unvalidated from HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR headers on form submissions, then prints it unescaped in the admin submission screen. An unauthenticated attacker can plant script that runs in the browser of an administrator who opens the submission.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","happyforms","self-hosted"],"confidence":0.7,"fix_status":"unknown","needs_auth":"no","worst_case":"Script runs in an administrator's browser, enabling account takeover on the site","analyst_note":"Confirm the fixed version of Happyforms after 1.38.9 from the WordPress plugin page or NVD entry.","how_to_check":"- Check whether the Happyforms plugin is installed and its version is `1.38.9` or lower in the WordPress admin plugin list\n- Look for the `happyforms_get_client_ip` function in the plugin's source files","plain_action":"","needs_analyst":true,"not_affected_if":["no-public-forms","plugin-not-installed"],"who_is_affected":"Sites running the Happyforms plugin at version 1.38.9 or earlier that accept public form submissions. The risk lands on administrators who review submissions in the WordPress admin, so sites with no public forms or no admin reviewing submissions carry less exposure. unknown whether a fixed version exists.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000749,"input_tokens":4385,"output_tokens":621,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-2026':12A,15A '-93755':13A,16A '1.38.9':98C 'access':184C 'admin':53B,148C 'administr':69B,180C 'arbitrari':167C 'attack':58B,164C 'browser':66B 'client':30B,36B,89C,106C,112C,132C 'cross':84C 'cross-sit':83C 'cve':11A,14A 'detail':153C 'due':101C 'echo':144C 'edit':150C 'escap':157C 'execut':174C 'form':45B,140C 'forward':41B,117C 'function':108C 'get':105C 'happyform':1A,17B,24B,75C,104C 'header':10A,43B,91C,120C 'host':21B 'http':35B,39B,111C,115C 'includ':97C 'inject':166C,186C 'ip':9A,31B,37B,90C,107C,113C,133C 'later':143C 'make':159C 'meta':131C,137C 'metabox':154C 'open':71B 'output':156C 'packag':18B 'page':171C,187C 'plant':60B 'plugin':3A,25B,76C 'possibl':161C 'post':130C,136C 'print':48B 'raw':110C 'read':109C 'request':119C 'review':181C 'run':63B 'sanit':125C 'screen':55B,151C 'script':61B,86C,169C 'self':20B 'self-host':19B 'site':85C 'spoof':8A 'spoofabl':88C 'store':5A,28B,82C,126C 'submiss':46B,54B,73B,141C,149C,183C 'taken':32B 'typic':178C 'unauthent':4A,57B,139C,163C 'unescap':50B 'unvalid':33B 'updat':135C 'user':177C 'valid':123C 'valu':128C 'version':93C 'via':87C,134C 'vulner':80C 'web':168C 'whenev':175C 'without':121C,155C 'wordpress':2A,22B,27B,78C 'x':40B,116C 'xss':6A","nicknames":[],"mitigations":[],"who_affected":"Sites running the Happyforms plugin at version 1.38.9 or earlier that accept public form submissions. The risk lands on administrators who review submissions in the WordPress admin, so sites with no public forms or no admin reviewing submissions carry less exposure. unknown whether a fixed version exists.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["happyforms","high","package","selfhosted","wordpress"],"campaign_type":null,"search_a":"'-2026':12A,15A '-93755':13A,16A 'cve':11A,14A 'happyform':1A 'header':10A 'ip':9A 'plugin':3A 'spoof':8A 'store':5A 'unauthent':4A 'wordpress':2A 'xss':6A","search_b":"'admin':53B 'administr':69B 'attack':58B 'browser':66B 'client':30B,36B 'form':45B 'forward':41B 'happyform':17B,24B 'header':43B 'host':21B 'http':35B,39B 'ip':31B,37B 'open':71B 'packag':18B 'plant':60B 'plugin':25B 'print':48B 'run':63B 'screen':55B 'script':61B 'self':20B 'self-host':19B 'store':28B 'submiss':46B,54B,73B 'taken':32B 'unauthent':57B 'unescap':50B 'unvalid':33B 'wordpress':22B,27B 'x':40B","search_c":"'1.38.9':98C 'access':184C 'admin':148C 'administr':180C 'arbitrari':167C 'attack':164C 'client':89C,106C,112C,132C 'cross':84C 'cross-sit':83C 'detail':153C 'due':101C 'echo':144C 'edit':150C 'escap':157C 'execut':174C 'form':140C 'forward':117C 'function':108C 'get':105C 'happyform':75C,104C 'header':91C,120C 'http':111C,115C 'includ':97C 'inject':166C,186C 'ip':90C,107C,113C,133C 'later':143C 'make':159C 'meta':131C,137C 'metabox':154C 'output':156C 'page':171C,187C 'plugin':76C 'possibl':161C 'post':130C,136C 'raw':110C 'read':109C 'request':119C 'review':181C 'sanit':125C 'screen':151C 'script':86C,169C 'site':85C 'spoofabl':88C 'store':82C,126C 'submiss':141C,149C,183C 'typic':178C 'unauthent':139C,163C 'updat':135C 'user':177C 'valid':123C 'valu':128C 'version':93C 'via':87C,134C 'vulner':80C 'web':168C 'whenev':175C 'without':121C,155C 'wordpress':78C 'x':116C","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-2026-93755","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93755","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"}