# CVE-2025-30158: NamelessMC Forum iframe width/height abuse causing UI-based Denial of Service

> An authenticated attacker can cause a UI-based denial of service in NamelessMC by injecting oversized iframes into forum posts, blocking user interactions.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Apr 2025
- **Updated:** 18 Apr 2025
- **Also known as:** GHSA-2prx-rgr7-hq5f

## What is CVE-2025-30158?

CVE-2025-30158 is a high-severity denial of service vulnerability in NamelessMC Nameless, published on 18 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

NamelessMC is a free, easy to use & powerful website software for Minecraft servers. In version 2.1.4 and prior, the forum allows users to post iframe elements inside forum topics/comments/feed with no restriction on the iframe's width and height attributes. This allows an authenticated attacker to perform a UI-based denial of service (DoS) by injecting oversized iframes that block the forum UI and disrupt normal user interactions. This issue has been patched in version 2.2.0.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2025-30158?

It affects 1 product.


Products: Namelessmc Nameless.

## How do I fix CVE-2025-30158?

No fix has been published for CVE-2025-30158 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-30158 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30158 exists.

## Other vulnerabilities in NamelessMC Nameless

- [CVE-2022-2821](https://insights.sbomify.com/CVE-2022-2821/): Missing Critical Step in Authentication in namelessmc/nameless (critical 9.8)
- [CVE-2025-54117](https://insights.sbomify.com/CVE-2025-54117/): NamelessMC allows Stored Cross-Site Scripting (XSS) in dashboard text editor (critical 9.1)
- [CVE-2025-22144](https://insights.sbomify.com/CVE-2025-22144/): Account Takeover in NamelessMC (critical 9.0)
- [CVE-2025-32389](https://insights.sbomify.com/CVE-2025-32389/): NamelessMC Vulnerable to SQL Injections in /user/messaging and /panel/users/reports Pages (high 8.6)
- [CVE-2025-29784](https://insights.sbomify.com/CVE-2025-29784/): NamelessMC Has Lack of Length Validation for s Parameter in GET Requests (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-30158 and fix it if it is affected.

What it is: CVE-2025-30158 is a high-severity denial of service vulnerability in NamelessMC Nameless, published on 18 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30158 exists.

Affected product: NamelessMC Nameless. 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-2025-30158/ (Markdown: https://insights.sbomify.com/CVE-2025-30158/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-30158
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-30158
- OSV: https://osv.dev/vulnerability/CVE-2025-30158

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-30158/
Summaries are generated and may contain mistakes; the official description above is the record.