CVE-2025-30158: nameless DoS — Exploit & Fix

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.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
namelessmc	nameless	< 2.2.0

References

Advisories & Patches

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

Exploits

https://github.com/NamelessMC/Nameless/security/advisories/GHSA-2prx-rgr7-hq5f https://github.com/NamelessMC/Nameless/security/advisories/GHSA-2prx-rgr7-hq5f

Other References

https://github.com/NamelessMC/Nameless/releases/tag/v2.2.0

Frequently Asked Questions

What is CVE-2025-30158? +

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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-30158? +

CVE-2025-30158 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-30158? +

CVE-2025-30158 affects products from namelessmc, specifically: nameless. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-30158? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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