Everest Forms <= 3.6.2 — Reflected Cross-Site Scripting via 'evf_toast_type' Parameter
CVE-2026-91152Published · Updated Action summary
Affected: ≤3.6.2Update to 3.6.3 or newer
All remediation steps- Severity
- Medium6.1
- CVSS
- 6.1CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:RUser interaction- Required
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI everest-forms
- Affected≤ 3.6.2
- Patched in3.6.3
Update to 3.6.3 or newer.
You are affected if you run ≤ 3.6.2. Version 3.6.3 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 3.6.3, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Yuto Hyakumoto.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI
All 31| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.5 | Unauthenticated Arbitrary File Read via 'Signature' Field Meta Key Branch of attach_entry_files ≤3.6.3No patch available | CVE-2026-115483 | |
| High8.2 | Unauthenticated Arbitrary File Deletion via 'everest_forms_{form_id}_old_{field_id}' Parameter ≤3.6.2Update to 3.6.3 | CVE-2026-120513 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤3.6.3Update to 3.6.4 | CVE-2026-122669 | |
| Medium4.3 | Missing Authorization ≤3.6.3Update to 3.6.4 | CVE-2026-120837 | |
| Medium6.5 | Insecure Direct Object Reference to Authenticated (Custom+) Arbitrary Entry/Form Disclosure and Deletion via MCP /tools/call JSON-RPC Endpoint ≤3.6.2Update to 3.6.3 | CVE-2026-89101 |
- High7.5Unauthenticated Arbitrary File Read via 'Signature' Field Meta Key Branch of attach_entry_files
≤3.6.3No patch available
- High8.2Unauthenticated Arbitrary File Deletion via 'everest_forms_{form_id}_old_{field_id}' Parameter
≤3.6.2Update to 3.6.3
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤3.6.3Update to 3.6.4
- Medium4.3Missing Authorization
≤3.6.3Update to 3.6.4
- Medium6.5Insecure Direct Object Reference to Authenticated (Custom+) Arbitrary Entry/Form Disclosure and Deletion via MCP /tools/call JSON-RPC Endpoint
≤3.6.2Update to 3.6.3
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
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- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
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Timeline
CVE published
Severity medium, CVSS 6.1
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.