What is the CVSS score of CVE-2025-54421?

CVE-2025-54421 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Nameless are affected by CVE-2025-54421?

Organizations using NamelessMC face moderate risk from CVE-2025-54421, a cross-site scripting vulnerability rated CVSS 7.2.. A patch is available.

Is there a public PoC exploit available for CVE-2025-54421?

Yes, a public proof-of-concept exploit is available for CVE-2025-54421. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-54421?

Within 30 days: Identify all affected systems running NamelessMC and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens and content security policies are enforced.

Nameless CVE-2025-54421

HIGH

Cross-site Scripting (XSS) (CWE-79)

2025-08-18 security-advisories@github.com

XSS Nameless

7.2

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.2 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:07 vuln.today

Patch released

Mar 28, 2026 - 19:07 nvd

Patch available

PoC Detected

Aug 20, 2025 - 21:23 vuln.today

Public exploit code

CVE Published

Aug 18, 2025 - 16:15 nvd

HIGH 7.2

DescriptionGitHub Advisory

NamelessMC is a free, easy to use & powerful website software for Minecraft servers. Cross-site scripting (XSS) vulnerability in NamelessMC before 2.2.4 allows remote authenticated attackers to inject arbitrary web script or HTML via the default_keywords crafted parameter. This vulnerability is fixed in 2.2.4.

AnalysisAI

NamelessMC is a free, easy to use & powerful website software for Minecraft servers. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. NamelessMC is a free, easy to use & powerful website software for Minecraft servers. Cross-site scripting (XSS) vulnerability in NamelessMC before 2.2.4 allows remote authenticated attackers to inject arbitrary web script or HTML via the default_keywords crafted parameter. This vulnerability is fixed in 2.2.4. Affected products include: Namelessmc Nameless. Version information: before 2.2.4.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

CVE-2025-54421 vulnerability details – vuln.today

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Nameless CVE-2025-54421

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code