CVE-2025-70845: lty628 aidigu XSS Vulnerability

CVE-2025-70845 Overview

CVE-2025-70845 is a Cross-Site Scripting (XSS) vulnerability discovered in lty628 aidigu version 1.9.1. The vulnerability exists in the /setting/ page where the "intro" field is not properly sanitized or escaped, allowing attackers to inject malicious scripts that execute in victims' browsers.

Critical Impact

Attackers can inject malicious JavaScript code through the unsanitized "intro" field, potentially leading to session hijacking, credential theft, and unauthorized actions on behalf of authenticated users.

Affected Products

• lty628 aidigu v1.9.1

Discovery Timeline

• 2026-02-12 - CVE CVE-2025-70845 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2025-70845

Vulnerability Analysis

This vulnerability represents a classic stored Cross-Site Scripting (XSS) flaw where user-supplied input through the "intro" field on the /setting/ page is rendered without adequate sanitization or output encoding. When malicious script content is submitted through this field, it becomes persistently stored and subsequently executed whenever other users view the affected page content.

The lack of input validation and output encoding creates an opportunity for attackers to embed arbitrary JavaScript code that will execute within the browser context of any user who accesses the compromised content. This type of stored XSS is particularly dangerous because the malicious payload persists on the server and can affect multiple users over time without requiring direct interaction with the attacker.

Root Cause

The root cause of this vulnerability is the absence of proper input sanitization and output encoding mechanisms in the application's handling of the "intro" field within the /setting/ endpoint. The application fails to validate, sanitize, or encode user-supplied data before storing it and rendering it back to users. This allows special characters and HTML/JavaScript syntax to be interpreted as executable code rather than treated as plain text data.

Attack Vector

The attack vector involves an authenticated attacker submitting crafted malicious JavaScript code through the "intro" field on the /setting/ page. Since the input is stored without sanitization, the malicious script persists in the application's database or storage mechanism. When other users navigate to pages where this intro content is displayed, the browser interprets and executes the injected JavaScript in the context of the vulnerable application.

A typical attack scenario would involve an attacker inserting script tags or event handlers containing malicious JavaScript. The payload could steal session cookies, redirect users to phishing pages, modify page content, or perform actions on behalf of the victim user. Technical details and proof-of-concept information can be found in the vulnerability research repository.

Detection Methods for CVE-2025-70845

Indicators of Compromise

• Unexpected JavaScript content or <script> tags present in user profile "intro" fields or database entries
• Anomalous HTTP requests to external domains originating from users viewing the /setting/ page
• User reports of unexpected browser behavior, redirects, or pop-ups when accessing application settings

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common XSS payloads in POST requests to the /setting/ endpoint
• Configure Content Security Policy (CSP) headers with reporting to identify attempted script injection attacks
• Deploy endpoint detection solutions like SentinelOne to monitor for suspicious browser activity and script execution patterns

Monitoring Recommendations

• Enable detailed logging for all requests to the /setting/ endpoint, including full request bodies
• Monitor application logs for patterns indicating XSS payload injection attempts (script tags, event handlers, encoded payloads)
• Set up alerts for any CSP violation reports related to inline script execution or connections to untrusted domains

How to Mitigate CVE-2025-70845

Immediate Actions Required

• Update lty628 aidigu to the latest available version if a patch has been released by the maintainer
• Review and sanitize any existing "intro" field data in the database to remove potentially malicious content
• Implement input validation to reject or encode HTML special characters in the "intro" field
• Deploy Content Security Policy headers to mitigate the impact of any successful XSS injection

Patch Information

No official vendor patch information is currently available. Organizations should monitor the aidigu GitHub repository for security updates and new releases. In the absence of an official patch, implementing the recommended workarounds is essential to reduce exposure.

Workarounds

• Implement server-side input validation to strip or encode HTML special characters (<, >, ", ', &) from the "intro" field before storage
• Apply output encoding when rendering the "intro" field content to ensure any stored data is displayed as text rather than interpreted as HTML/JavaScript
• Configure strict Content Security Policy (CSP) headers with script-src 'self' to prevent execution of inline scripts
• Consider restricting access to the /setting/ page to trusted users only until a permanent fix is applied

# Example Content Security Policy header configuration
# Add to web server configuration or application response headers
Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; object-src 'none';