CVE-2024-40604Public exploitNetwork attack vector

Stored XSS via unescaped sidebar text

Published Jul 6, 2024 · Updated Mar 18, 2025

Stored XSS in the Nimbus skin for MediaWiki through 1.42.1 allows remote authenticated users to execute scripts in visitors' browsers. NimbusTemplate.php appends unescaped text from MediaWiki:Nimbus-sidebar menu and submenu entries directly to generated navigation HTML. Editing the interface message requires high privileges, and execution requires another user to render the sidebar, enabling browser-context data access or page modification.

CVSS severity4.8
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the Nimbus skin for MediaWiki through 1.42.1 allows remote authenticated users to execute scripts in visitors' browsers. NimbusTemplate.php appends unescaped text from MediaWiki:Nimbus-sidebar menu and submenu entries directly to generated navigation HTML. Editing the interface message requires high privileges, and execution requires another user to render the sidebar, enabling browser-context data access or page modification.

The record

CVE
CVE-2024-40604
Published
Jul 6, 2024
Updated
Mar 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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