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CVE-2025-53480— CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate (Account information tab) via unsanitized i18n messages

Quick assessment

Affected
Wikimedia Foundation Mediawiki - CheckUser extension
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wikimedia Mediawiki - CheckUser Extension是Wikimedia基金会的一个查询IP地址的扩展。 Wikimedia Mediawiki - CheckUser Extension存在安全漏洞，该漏洞源于Account information tab中的特定国际化消息未正确转义，可能导致反射型跨站脚本攻击。以下版本受到影响：1.39.13版本之前的1.39.x版本、1.42.7版本之前的1.42.x版本和1.43.2版本之前的1.43.x版本。

AI Predicted 5.4 Difficulty: Easy EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-53480

Vulnerability Information
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Vulnerability Title
CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate (Account information tab) via unsanitized i18n messages
Source: CVE Program / CVE List V5
Vulnerability Description
The CheckUser extension’s Special:Investigate page has a vulnerability in the Account information tab, where specific internationalized messages are rendered without proper escaping. Attackers can exploit this by appending ?uselang=x-xss to the URL, causing reflected XSS when the UI renders affected message keys. This issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Wikimedia Mediawiki - CheckUser Extension 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wikimedia Mediawiki - CheckUser Extension是Wikimedia基金会的一个查询IP地址的扩展。 Wikimedia Mediawiki - CheckUser Extension存在安全漏洞，该漏洞源于Account information tab中的特定国际化消息未正确转义，可能导致反射型跨站脚本攻击。以下版本受到影响：1.39.13版本之前的1.39.x版本、1.42.7版本之前的1.42.x版本和1.43.2版本之前的1.43.x版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wikimedia Foundation Mediawiki - CheckUser extension 1.39.x ~ 1.39.13 -

II. Public POCs for CVE-2025-53480

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III. Intelligence Information for CVE-2025-53480

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Patches & Fixes for CVE-2025-53480 (1)

Same Patch Batch · Wikimedia Foundation · 2025-07-08 · 4 CVEs total

CVE-2025-7362 MsUpload: Stored Cross-Site Scripting (XSS) via unsanitized msu-continue system message
CVE-2025-7363 TitleIcon: Stored Cross-Site Scripting (XSS) via #titleicon_unicode parser function
CVE-2025-53479 CheckUser: Reflected Cross-Site Scripting (XSS) in Special:CheckUser via unsanitized inter

IV. Related Vulnerabilities

Same product: Mediawiki - CheckUser extension
Same vendor: Wikimedia Foundation
Same weakness: CWE-79

V. Comments for CVE-2025-53480

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