CVE-2025-54421: NamelessMC allows Stored Cross Site Scripting (XSS) in SEO component

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-08-18 · updated 2026-06-17
Weakness: CWE-79

Description

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

NamelessMC Nameless: before 2.2.4 — fixed in 2.2.4

How to fix

Upgrade to a fixed version: NamelessMC Nameless 2.2.4. Check the vendor advisory for mitigations.

References

https://github.com/NamelessMC/Nameless/commit/56d35cff9ee944c061791ef478cabd2bed0223c4
https://github.com/NamelessMC/Nameless/security/advisories/GHSA-f5rm-w4mx-q7rx

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