CVE-2025-54421Public exploitNetwork attack vector

Stored XSS via unescaped SEO keywords

Published Aug 18, 2025 · Updated Aug 18, 2025

Stored XSS in NamelessMC before 2.2.4 allows remote authenticated users to execute arbitrary script through the default_keywords field. The SEO panel passes the stored default_meta_keywords setting into DEFAULT_KEYWORDS_VALUE without Output::getClean, leaving crafted HTML attribute content unescaped when the panel renders. An account with permission to access the SEO section is required, and the injected script executes in the browser when the affected panel displays the stored value.

CVSS severity7.2
High
EPSS probability0.39%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in NamelessMC before 2.2.4 allows remote authenticated users to execute arbitrary script through the default_keywords field. The SEO panel passes the stored default_meta_keywords setting into DEFAULT_KEYWORDS_VALUE without Output::getClean, leaving crafted HTML attribute content unescaped when the panel renders. An account with permission to access the SEO section is required, and the injected script executes in the browser when the affected panel displays the stored value.

The record

CVE
CVE-2025-54421
Published
Aug 18, 2025
Updated
Aug 18, 2025
Vendor
NamelessMC
Product
Nameless
Classifications
CWE-80, CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

NamelessMC · Namelessversion=< 2.2.4

Published CVSS scores

7.2GitHub CNACVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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