CVE-2025-51863: Self-XSS Vulnerability in ChatGPT Unli via SVG Upload
Welcome to a deep dive into CVE-2025-51863, a security vulnerability affecting ChatGPT Unli. This post will guide you through the details of the flaw, its potential impact, and recommended steps to protect yourself.
🔍 TL;DR Summary
CVE-2025-51863 describes a self cross-site scripting (XSS) vulnerability in ChatGPT Unli. By uploading a specially crafted SVG file to the chat interface, an attacker can potentially execute arbitrary code within a user's browser session. Although the attack requires user interaction, the potential for misuse is significant, especially considering the popularity of ChatGPT Unli.
🚨 Vulnerability Details
CVE ID
CVE-2025-51863
Description
A self Cross Site Scripting (XSS) vulnerability in ChatGPT Unli (ChatGPTUnli.com) thru 2025-05-26 allows attackers to execute arbitrary code via a crafted SVG file to the chat interface. The attack requires the victim to upload the malicious SVG themselves, making it a 'self-XSS' scenario.
CVSS Score and Vector
- Score: 6.1 (Medium)
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Explanation: This CVSS vector indicates the vulnerability is accessible over the network (AV:N) with low attack complexity (AC:L). No privileges are required (PR:N), but user interaction is needed (UI:R). The scope is changed (S:C), meaning the injected code can potentially affect other parts of the application. The impact on confidentiality (C:L) and integrity (I:L) is low, while availability (A:N) is not affected. The 'self' nature of the attack reduces the severity compared to a regular XSS vulnerability.
Exploit Requirements
To exploit this vulnerability, an attacker needs to craft a malicious SVG file containing JavaScript code. The victim must then upload and view this file through the ChatGPT Unli chat interface. Social engineering may be used to convince users to upload the malicious SVG.
Affected Vendor, Product, Version
- Vendor: ChatGPT Unli (ChatGPTUnli.com)
- Product: ChatGPT Unli
- Version: Thru 2025-05-26
CWE
- CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Explanation: CWE-79 describes a situation where an application does not properly sanitize user-supplied data before including it in a web page. This allows an attacker to inject malicious scripts that are executed in the victim's browser.
📅 Timeline of Events
- 2025-05-26: Vulnerability present in ChatGPT Unli.
- 2025-07-22: CVE-2025-51863 assigned.
🧠 Exploitability & Real-World Risk
While classified as a 'self-XSS', the risk should not be completely dismissed. An attacker could potentially trick a user into uploading a malicious SVG file through social engineering or by disguising it as something harmless. If successful, the attacker could execute arbitrary JavaScript code in the user's browser within the context of the ChatGPT Unli application. This could lead to account takeover, data theft, or other malicious activities.
🛠️ Recommendations
Here are some steps you can take to protect yourself:
- Be cautious when uploading files: Only upload files from trusted sources.
- Avoid suspicious links: Do not click on links from unknown senders or websites.
- Keep software up to date: Ensure your web browser and operating system are updated with the latest security patches.
- ChatGPT Unli Vendor: Implement proper input validation and sanitization to prevent XSS vulnerabilities. Properly sanitize SVG uploads.
🧪 Technical Insight
The vulnerability likely stems from ChatGPT Unli not properly sanitizing SVG files before displaying them in the chat interface. SVG files can contain embedded JavaScript code, which, if not properly neutralized, can be executed by the user's browser. The application needs to ensure that any potentially malicious code within SVG files is removed or neutralized before being displayed.
🙌 Credit to Researcher(s)
This vulnerability was reported by Secsys-FDU.
🔗 References
🧵 Tags
#CVE-2025-51863 #ChatGPTUnli #SelfXSS #XSS #SVG #Vulnerability #Security #Cybersecurity
Summary: CVE-2025-51863 is a self cross-site scripting (XSS) vulnerability in ChatGPT Unli, allowing attackers to execute arbitrary code via crafted SVG files. Users should be cautious when uploading files and avoid suspicious links.
CVE ID: CVE-2025-51863
Risk Analysis: Successful exploitation could lead to account takeover, data theft, or other malicious activities within the context of the ChatGPT Unli application. While it's a 'self-XSS', user interaction is required, making it less severe than typical XSS.
Recommendation: Users should be cautious when uploading files, especially from untrusted sources. ChatGPT Unli developers should implement proper input validation and sanitization to prevent XSS vulnerabilities.
Timeline
- 2025-05-26: Vulnerability present in ChatGPT Unli.
- 2025-07-22: CVE-2025-51863 assigned.