{"id":"CVE-2026-91152","kind":"vulnerability","aliases":["CVE-2026-91152"],"related":[],"title":"Everest Forms WordPress plugin: reflected XSS via evf_toast_type parameter","description":"The Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'evf_toast_type' parameter in all versions up to, and including, 3.6.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires the sibling evf_toast parameter to decode successfully via atob(), but this is a trivially attacker-controlled prerequisite.","summary":"The Everest Forms form builder plugin for WordPress does not sanitize the evf_toast_type parameter, so a crafted link can inject script into a page. An attacker who tricks a logged-in user into clicking the link can run scripts in that user's browser session.","severity":"medium","cvss":6.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["everest-forms","package","wordpress"],"not_affected_if":["plugin-not-installed"],"how_to_check":"- Check whether the Everest Forms plugin is installed and its version in the WordPress admin under Plugins\n- Look for the plugin version `3.6.2` or earlier in the plugin header","fix":"- Everest Forms: unknown fixed version; sources state only that all versions up to and including `3.6.2` are affected","status":"open","published_at":"2026-10-29T10:17:06+00:00","first_seen_at":"2026-10-29T10:24:25+00:00","triaged_at":"2026-10-29T10:25:25+00:00","updated_at":"2026-10-29T10:25:25+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-29T10:25:25Z","model":"claude-haiku-5-5","output":{"fix":"- Everest Forms: unknown fixed version; sources state only that all versions up to and including `3.6.2` are affected","reach":"internet","title":"Everest Forms WordPress plugin: reflected XSS via evf_toast_type parameter","impact":"medium","summary":"The Everest Forms form builder plugin for WordPress does not sanitize the evf_toast_type parameter, so a crafted link can inject script into a page. An attacker who tricks a logged-in user into clicking the link can run scripts in that user's browser session.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","everest-forms"],"confidence":0.6,"fix_status":"unknown","needs_auth":"no","worst_case":"script runs in a victim's browser session on the site","analyst_note":"Confirm the first patched Everest Forms version from the vendor or WordPress plugin changelog; NVD text does not state it.","how_to_check":"- Check whether the Everest Forms plugin is installed and its version in the WordPress admin under Plugins\n- Look for the plugin version `3.6.2` or earlier in the plugin header\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["plugin-not-installed"],"who_is_affected":"Sites running the Everest Forms plugin version 3.6.2 or earlier are exposed through a crafted link that the attacker must get a user to click. The sources do not say whether any non-default configuration is needed. Sites without this plugin can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000706,"input_tokens":4264,"output_tokens":560,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':13A,16A '-91152':14A,17A '3.6.2':109C 'action':144C 'ai':84C 'arbitrari':127C 'atob':162C 'attack':50B,124C,169C 'attacker-control':168C 'browser':69B 'builder':27B,82C 'click':59B,147C 'contact':74C 'control':170C 'craft':41B 'cross':93C 'cross-sit':92C 'custom':80C 'cve':12A,15A 'decod':159C 'due':110C 'escap':117C 'everest':1A,19B,24B,72C 'everest-form':18B 'evf':8A,35B,98C,155C 'execut':133C 'exploit':151C 'form':2A,20B,25B,26B,73C,75C,77C,81C 'includ':108C 'inject':44B,126C 'input':113C 'insuffici':112C 'link':42B,61B,150C 'log':55B 'logged-in':54B 'make':119C 'output':116C 'packag':21B 'page':48B,131C 'paramet':11A,38B,101C,157C 'payment':76C 'perform':142C 'plugin':4A,28B,85C 'possibl':121C 'prerequisit':171C 'quiz':78C 'reflect':5A,91C 'requir':152C 'run':63B 'sanit':33B,114C 'script':45B,64B,95C,129C 'session':70B 'sibl':154C 'site':94C 'success':137C,160C 'survey':79C 'toast':9A,36B,99C,156C 'trick':52B,138C 'trivial':167C 'type':10A,37B,100C 'unauthent':123C 'user':57B,67B,140C 'version':104C 'via':7A,96C,161C 'vulner':89C 'web':128C 'wordpress':3A,22B,30B,87C 'xss':6A","nicknames":[],"mitigations":[],"who_affected":"Sites running the Everest Forms plugin version 3.6.2 or earlier are exposed through a crafted link that the attacker must get a user to click. The sources do not say whether any non-default configuration is needed. Sites without this plugin can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T10:17:06+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-91152","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91152","severity":null,"published_at":"2026-10-29T10:17:06+00:00","modified_at":"2026-10-29T10:17:06+00:00","first_seen_at":"2026-10-29T10:24:25+00:00","fetched_at":"2026-10-29T10:24:25+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"}