CVE-2025-67477Network attack vector

Stored XSS via unescaped word-separator system message

Published Feb 3, 2026 · Updated Feb 3, 2026

Stored XSS in Wikimedia Foundation MediaWiki 1.44 before 1.44.3 and 1.45 before 1.45.1 allows remote authenticated users to run script. ApiSandboxLayout.js inserts the administrator-editable word-separator system message into the Special:ApiSandbox DOM without escaping it as text. High privileges are required to modify the message; script then executes for users who open the API sandbox, exposing data and actions available to their sessions.

CVSS severity6.1
Medium
EPSS probability0.22%
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 Wikimedia Foundation MediaWiki 1.44 before 1.44.3 and 1.45 before 1.45.1 allows remote authenticated users to run script. ApiSandboxLayout.js inserts the administrator-editable word-separator system message into the Special:ApiSandbox DOM without escaping it as text. High privileges are required to modify the message; script then executes for users who open the API sandbox, exposing data and actions available to their sessions.

The record

CVE
CVE-2025-67477
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record 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=* <1.44.3, 1.45.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Wikimedia Foundation · MediaWikiversion=* <1.44.3, 1.45.1

Published CVSS scores

6.1OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
0.0Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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