# CVE-2025-8838: WinterChenS my-site Backend admin preHandle improper authentication

> Improper authentication in the backend admin interface allows remote attackers to bypass login restrictions, though the maintainer disputes the exploit's validity.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2025
- **Updated:** 11 Aug 2025
- **Also known as:** GHSA-5rgc-2f8v-p8gj

## What is CVE-2025-8838?

CVE-2025-8838 is a medium-severity authentication bypass vulnerability in WinterChenS my-site, published on 11 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in WinterChenS my-site up to 1f7525f15934d9d6a278de967f6ec9f1757738d8. This vulnerability affects the function preHandle of the file /admin/ of the component Backend Interface. The manipulation of the argument uri leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The real existence of this vulnerability is still doubted at the moment. This product is using a rolling release to provide continious delivery. Therefore, no version details for affected nor updated releases are available. The code maintainer responded to the issue that "[he] tried it, and using this link automatically redirects to the login page."

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2025-8838?

It affects 1 product.


Products: Winterchens My-Site.

## How do I fix CVE-2025-8838?

No fix has been published for CVE-2025-8838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8838 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8838 exists.

## Other vulnerabilities in WinterChenS my-site

- [CVE-2024-53496](https://insights.sbomify.com/CVE-2024-53496/): Missing authorization in n/a (critical 9.8)
- [CVE-2025-50904](https://insights.sbomify.com/CVE-2025-50904/): Auth bypass in n/a (critical 9.8)
- [CVE-2024-53495](https://insights.sbomify.com/CVE-2024-53495/): Missing authorization in n/a (high 7.5)
- [CVE-2024-57152](https://insights.sbomify.com/CVE-2024-57152/): Missing authorization in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8838 and fix it if it is affected.

What it is: CVE-2025-8838 is a medium-severity authentication bypass vulnerability in WinterChenS my-site, published on 11 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8838 exists.

Affected product: WinterChenS my-site. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-8838/ (Markdown: https://insights.sbomify.com/CVE-2025-8838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8838
- OSV: https://osv.dev/vulnerability/CVE-2025-8838

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8838/
Summaries are generated and may contain mistakes; the official description above is the record.