{"id":"CVE-2026-14556","kind":"vulnerability","aliases":["CVE-2026-14556"],"related":[],"title":"HappyForms WordPress plugin: unescaped referral value injects HTML into admin emails","description":"The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a user-controlled referral value before embedding it in the form notification email, allowing unauthenticated attackers to inject arbitrary HTML into the emails site administrators receive.","summary":"The HappyForms WordPress plugin before 1.26.15 places a user-supplied referral value into form notification emails without sanitising or escaping it. An unauthenticated attacker can inject arbitrary HTML into the emails that site administrators receive.","severity":"medium","cvss":5.4,"epss":0.00155,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["happyforms","package","self-hosted","wordpress"],"not_affected_if":["patched-version","plugin-not-installed"],"how_to_check":"- Check the installed HappyForms version in the WordPress admin plugin list or with `wp plugin get happyforms --field=version`, and compare it against `1.26.15`.\n- Look for the HappyForms plugin directory in `wp-content/plugins/` on the server.","fix":"- Update the HappyForms plugin to `1.26.15` or later.\n- If an update is not possible, disable the HappyForms plugin until it is patched.","status":"open","published_at":"2026-10-21T09:17:07+00:00","first_seen_at":"2026-10-23T21:57:28+00:00","triaged_at":"2026-10-25T04:14:38+00:00","updated_at":"2026-10-25T04:14:38+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:14:38Z","model":"claude-haiku-5-5","output":{"fix":"- Update the HappyForms plugin to `1.26.15` or later.\n- If an update is not possible, disable the HappyForms plugin until it is patched.","reach":"internet","title":"HappyForms WordPress plugin: unescaped referral value injects HTML into admin emails","impact":"low","summary":"The HappyForms WordPress plugin before 1.26.15 places a user-supplied referral value into form notification emails without sanitising or escaping it. An unauthenticated attacker can inject arbitrary HTML into the emails that site administrators receive.","category":"package","nicknames":[],"who_cares":["wordpress","happyforms","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker injects HTML into admin notification emails, enabling phishing of site administrators","analyst_note":"","how_to_check":"- Check the installed HappyForms version in the WordPress admin plugin list or with `wp plugin get happyforms --field=version`, and compare it against `1.26.15`.\n- Look for the HappyForms plugin directory in `wp-content/plugins/` on the server.","needs_analyst":false,"not_affected_if":["plugin-not-installed","patched-version"],"who_is_affected":"Sites running the HappyForms plugin before 1.26.15 that send form notification emails containing the referral value are exposed. Sites without HappyForms, or running `1.26.15` or later, are not affected.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000601,"input_tokens":3346,"output_tokens":532,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-14556':14A,17A '-2026':13A,16A '1.26.15':29B,65C 'admin':10A 'administr':58B,96C 'allow':85C 'arbitrari':51B,90C 'attack':48B,87C 'control':74C 'cve':12A,15A 'email':11A,40B,55B,84C,94C 'embed':78C 'escap':44B,70C 'form':38B,82C 'happyform':1A,18B,25B,61C 'host':22B 'html':8A,52B,91C 'inject':7A,50B,89C 'notif':39B,83C 'packag':19B 'place':30B 'plugin':3A,27B,63C 'receiv':59B,97C 'referr':5A,35B,75C 'sanitis':42B,68C 'self':21B 'self-host':20B 'site':57B,95C 'suppli':34B 'unauthent':47B,86C 'unescap':4A 'user':33B,73C 'user-control':72C 'user-suppli':32B 'valu':6A,36B,76C 'without':41B 'wordpress':2A,23B,26B,62C","nicknames":[],"mitigations":[],"who_affected":"Sites running the HappyForms plugin before 1.26.15 that send form notification emails containing the referral value are exposed. Sites without HappyForms, or running `1.26.15` or later, are not affected.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-21T09:17:07+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","cvss_by":"contact@wpscan.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-14556","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-14556","severity":null,"published_at":"2026-10-21T09:17:07+00:00","modified_at":"2026-10-21T18:37:38+00:00","first_seen_at":"2026-10-23T21:57:28+00:00","fetched_at":"2026-10-23T22:29:01+00:00","note":null},{"source":"epss","external_id":"CVE-2026-14556","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-14556","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T13:15:54+00:00","fetched_at":"2026-10-24T13:15:54+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}