What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-18 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• NamelessMC Nameless: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: NamelessMC Nameless 2.2.0. Check the vendor advisory for mitigations.

References

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

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