CVE-2025-8838: High Auth Bypass Claim in WinterChenS my-site

CVE-2025-8838 is a high severity improper authentication report in WinterChenS my-site, in the preHandle function that guards /admin/. Its existence is disputed: the record says it is still doubted, and the maintainer could not reproduce it. The project uses rolling releases, so no fixed version is listed.

What's affected

• Product: WinterChenS my-site, up to commit 1f7525f15934d9d6a278de967f6ec9f1757738d8.
• Component: the backend interface interceptor preHandle for /admin/, through the uri value.
• Weakness: CWE-287 (improper authentication).
• Score: CVSS 3.1 base 7.3, High, vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. It is network reachable and needs no privileges.
• Fixed version: none. The record says the product uses a rolling release, so no version details of affected or updated releases are available.

Here the sources disagree about whether the flaw exists at all. The record says the real existence of the vulnerability is still doubted, and quotes the code maintainer replying that he tried the reported path and that it redirected to the login page. The GitHub issue thread I read shows the reporter replying on 19 June 2025 with the commit they tested, and a later commenter on 14 August 2025 reporting the same behavior on that commit. So the thread contains both a failed and a successful reproduction. This post cannot settle it. Treat the High score as the reporter's claim.

The record says the exploit has been disclosed publicly. It does not flag exploitation in the wild, and the CVE is not in the CISA Known Exploited Vulnerabilities catalog.

How to check if you're exposed

First, see whether your code includes the commit or descends from it.

git log --oneline | head
git merge-base --is-ancestor 1f7525f15934d9d6a278de967f6ec9f1757738d8 HEAD && echo "contains the tested commit"

Then test your own deployment instead of relying on either side of the dispute. The issue describes a path form that mixes a public route with a relative step toward a protected one. In a test environment you control, request protected admin routes with unusual path forms and confirm that the application returns a login redirect or a denial every time. Do not test systems you do not own.

You can also read the interceptor. Look at how it decides that a request is for a protected route, and whether it compares the raw request string, a decoded one, or a normalized path.

What to do now

1. Identify any service built from my-site and the commit it uses.
2. Decide the rule centrally. Protect admin routes by a framework level security configuration rather than by a hand written string check in an interceptor.
3. Normalize and decode the path before any comparison, and reject requests with unusual path forms.
4. Add a reverse proxy rule so that admin paths are reachable only from trusted networks.
5. Add an automated test that requests every admin route without a session and expects a denial.
6. Check the project issue for maintainer updates, and re-evaluate if a fix is announced.

Why it matters

Interceptors that match on strings are a common source of authentication gaps. The web server, the framework and the interceptor each interpret the same URL slightly differently, and an attacker looks for a form that is read as public by one and as protected by another.

This case also shows how a disputed CVE should be handled. The prudent move is to check your own behavior and harden the check, not to wait for the argument to end. A control that works by luck on one framework version is not a control.

You can run the free in-browser dependency scan at gold.safeguard.sh/scan on your manifests to see which known-vulnerable packages you carry. It reads dependencies, so it will not see a flaw that lives only in an application's own source.

Quick check

Sources

• Safeguard Gold entry: CVE-2025-8838 (NVD record data: description, CVSS, CWEs, published 2025-08-11)
• Issue listed in the record: WinterChenS/my-site issue 97

Last reviewed: 18 October 2026.