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

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

Which versions are affected by CVE-2025-30158?

It affects 1 product.

Products include 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.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

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 Missing Critical Step in Authentication in namelessmc/nameless Critical 9.8
• CVE-2025-54117 NamelessMC allows Stored Cross-Site Scripting (XSS) in dashboard text editor Critical 9.1
• CVE-2025-22144 Account Takeover in NamelessMC Critical 9.0
• CVE-2025-32389 NamelessMC Vulnerable to SQL Injections in /user/messaging and /panel/users/reports Pages High 8.6
• CVE-2025-29784 NamelessMC Has Lack of Length Validation for s Parameter in GET Requests High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2prx-rgr7-hq5f.