CVE-2024-40605Public exploitNetwork attack vector

Stored XSS via unsafe sidebar ID escaping

Published Jul 6, 2024 · Updated Mar 14, 2025

Stored XSS in MediaWiki Foreground through 1.42.1 allows remote authenticated users to execute scripts via top-level sidebar entries. ForegroundTemplate.php inserts Sanitizer::escapeIdForAttribute output into single-quoted HTML attributes even though that output is not HTML-safe. An account with editinterface permission must store the entry, and a visitor must load a page using Foreground for the script to run in that visitor's browser.

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 MediaWiki Foreground through 1.42.1 allows remote authenticated users to execute scripts via top-level sidebar entries. ForegroundTemplate.php inserts Sanitizer::escapeIdForAttribute output into single-quoted HTML attributes even though that output is not HTML-safe. An account with editinterface permission must store the entry, and a visitor must load a page using Foreground for the script to run in that visitor's browser.

The record

CVE
CVE-2024-40605
Published
Jul 6, 2024
Updated
Mar 14, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki
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 14, 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?

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

  1. Affected versionversion=0 <=1.42.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wikimedia Foundation · MediaWikiversion=0 <=1.42.1

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8NVDCVSS: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')
T1059.007Command 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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