CVE-2026-67925: JeecgBoot XSS Vulnerability

CVE-2026-67925 Overview

CVE-2026-67925 is a Cross-Site Scripting (XSS) vulnerability in JeecgBoot v3.9.2, a low-code development platform. The flaw resides in the /airag/chat/upload endpoint and allows a remote attacker to inject and execute arbitrary script content in the context of a victim's browser session. Successful exploitation requires user interaction, such as viewing crafted content served through the affected endpoint. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Attackers can execute arbitrary JavaScript in an authenticated user's browser through the /airag/chat/upload endpoint, enabling session theft, credential harvesting, and unauthorized actions within the JeecgBoot application.

Affected Products

JeecgBoot v3.9.2
JeecgBoot AI RAG chat upload module (/airag/chat/upload)
Downstream applications built on the affected JeecgBoot release

Discovery Timeline

2026-08-17 - CVE-2026-67925 published to NVD
2026-08-18 - Last updated in NVD database

Technical Details for CVE-2026-67925

Vulnerability Analysis

The vulnerability is a reflected or stored Cross-Site Scripting flaw exposed through the /airag/chat/upload endpoint of JeecgBoot v3.9.2. The endpoint accepts user-supplied content associated with the AI RAG (Retrieval-Augmented Generation) chat feature and returns it to the browser without sufficient output encoding. Attackers can craft a payload containing HTML or JavaScript that the browser parses and executes. Because the scope of the CVSS vector is marked as changed, the injected script can cross security boundaries within the application. Exploitation requires the victim to interact with a malicious link, uploaded file, or crafted chat resource served by the vulnerable instance.

Root Cause

The root cause is missing or inadequate input sanitization and output encoding in the request handler backing /airag/chat/upload. User-controlled data is rendered into HTML responses without escaping characters such as <, >, ", and '. This allows attacker-controlled markup and JavaScript to be interpreted by the browser rather than treated as inert text.

Attack Vector

The attack is delivered over the network and requires user interaction. An attacker submits a crafted request to /airag/chat/upload containing a JavaScript payload embedded in a filename, metadata field, or chat parameter. When another authenticated user retrieves or previews the resource, the browser executes the injected script under the JeecgBoot origin. Consult the GitHub Issue Report for reproduction details.

Detection Methods for CVE-2026-67925

Indicators of Compromise

Requests to /airag/chat/upload containing HTML tags such as <script>, <img onerror=>, or <svg onload=> in request bodies or filenames.
Uploaded chat resources whose filenames or metadata fields contain URL-encoded angle brackets (%3Cscript%3E) or JavaScript event handlers.
Unexpected outbound requests from user browsers to attacker-controlled hosts following interaction with JeecgBoot chat resources.

Detection Strategies

Inspect web server and application logs for anomalous payloads submitted to /airag/chat/upload, focusing on script tags and event-handler attributes.
Deploy WAF signatures targeting reflected and stored XSS patterns on the JeecgBoot AI RAG endpoints.
Correlate authenticated session activity with suspicious DOM-based redirects or credential submissions from browsers accessing JeecgBoot.

Monitoring Recommendations

Enable HTTP request and response body logging for /airag/* routes and forward logs to a centralized analytics platform.
Alert on Content Security Policy (CSP) violation reports originating from JeecgBoot origins.
Monitor for spikes in file upload requests containing non-standard MIME types or oversized metadata fields.

How to Mitigate CVE-2026-67925

Immediate Actions Required

Restrict access to the JeecgBoot /airag/chat/upload endpoint to trusted internal networks until a fixed release is deployed.
Enforce a strict Content Security Policy that blocks inline scripts and unauthorized script sources on JeecgBoot origins.
Require re-authentication for privileged actions to reduce the impact of session hijacking through XSS.

Patch Information

No vendor patch reference is included in the current NVD entry. Track upstream remediation via the JeecgBoot GitHub Issue Report and upgrade to a release beyond v3.9.2 once the maintainers publish a fix. Validate any fix by confirming that responses from /airag/chat/upload encode HTML control characters.

Workarounds

Place JeecgBoot behind a web application firewall with rules that block script tags and JavaScript event handlers in uploads.
Apply server-side output encoding by wrapping response rendering in a library such as OWASP Java Encoder for any data returned from the AI RAG endpoints.
Disable the AI RAG chat upload feature if it is not required for business operations.

bash

# Example nginx rule to block obvious XSS payloads on the vulnerable endpoint
location /airag/chat/upload {
    if ($request_body ~* "(<script|onerror=|onload=|javascript:)") {
        return 403;
    }
    proxy_pass http://jeecgboot_backend;
}