CVE-2026-5478— Everest Forms <= 3.4.4 - Unauthenticated Arbitrary File Read and Deletion via Upload Field 'old_files' Parameter
Quick assessment
Affected
wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Everest Forms 3.4.4及之前版本存在安全漏洞，该漏洞源于信任攻击者控制的old_files数据并使用基于正则表达式的字符串替换，可能导致未经验证的攻击者读取或删除任意本地文件。
Possible ATT&CK Techniques 3 AI
T1111 · Multi-Factor Authentication Interception T1135 · Network Share Discovery T1485 · Data Destruction
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-5478
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Everest Forms <= 3.4.4 - Unauthenticated Arbitrary File Read and Deletion via Upload Field 'old_files' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Everest Forms plugin for WordPress is vulnerable to Arbitrary File Read and Deletion in all versions up to, and including, 3.4.4. This is due to the plugin trusting attacker-controlled old_files data from public form submissions as legitimate server-side upload state, and converting attacker-supplied URLs into local filesystem paths using regex-based string replacement without canonicalization or directory boundary enforcement. This makes it possible for unauthenticated attackers to read arbitrary local files (e.g., wp-config.php) by injecting path-traversal payloads into the old_files upload field parameter, which are then attached to notification emails. The same path resolution is also used in the post-email cleanup routine, which calls unlink() on the resolved path, resulting in the targeted file being deleted after being attached. This can lead to full site compromise through disclosure of database credentials and authentication salts from wp-config.php, and denial of service through deletion of critical files. Prerequisite: The form must contain a file-upload or image-upload field, and disable storing entry information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Everest Forms 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Everest Forms 3.4.4及之前版本存在安全漏洞，该漏洞源于信任攻击者控制的old_files数据并使用基于正则表达式的字符串替换，可能导致未经验证的攻击者读取或删除任意本地文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| wpeverest | Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder | 0 ~ 3.4.4 | - |
|
II. Public POCs for CVE-2026-5478
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
default-local-qwen3.6
· 14016 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month
III. Intelligence Information for CVE-2026-5478
请登录查看更多情报信息。
IV. Related Vulnerabilities
-
CVE-2026-4888
Everest Forms – Contact Form, Payment Form, Quiz, Survey & C -
CVE-2026-3296
Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injectio -
CVE-2025-3421
Everest Forms <= 3.1.1 - Reflected Cross-Site Scripting -
CVE-2025-3439
Everest Forms – Contact Form, Quiz, Survey, Newsletter & Pay -
CVE-2025-3422
Everest Forms <= 3.1.1 - Authenticated (Subscriber+) Arbitra
Same vendor: wpeverest
-
CVE-2026-74017
WordPress User Registration plugin <= 5.2.7 - Broken Access -
CVE-2026-62103
WordPress Everest Forms plugin <= 3.6.0 - PHP Object Injecti -
CVE-2026-5096
Everest Forms <= 3.4.4 - Unauthenticated Server-Side Request -
CVE-2026-74001
WordPress User Registration & Membership Pro plugin <= 5.4.5 -
CVE-2026-73995
WordPress User Registration plugin <= 5.2.6 - Broken Authent
Same weakness: CWE-22
-
CVE-2026-105820
Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy -
CVE-2026-105816
Vault Vulnerable to Arbitrary Code Execution via Plugin Cata -
CVE-2026-106557
Backstage: Improper input validation in TechDocs Markdown ex -
CVE-2026-101886
Cisco Jabber for Android Path Traversal via Shared Content U -
CVE-2026-106560
Backstage: Improper repository path validation in a Scaffold
V. Comments for CVE-2026-5478
No comments yet