CVE-2025-62698 - CVE House
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Status published Medium CVE-2025-62698

Stored XSS through system messages in ExternalGuidance

Vulnerability Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - ExternalGuidance allows Stored XSS.This issue affects Mediawiki - ExternalGuidance: from master before 1.39.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • SomeRandomDeveloper

References

More from The Wikimedia Foundation

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CVE-2025-62702
Stored XSS through system messages
Medium 6.9
CVE-2025-62701
Stored XSS through system messages
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CVE-2025-62700
Stored XSS through a system message in MultiBoilerplate
Medium 6.9
CVE-2025-62699
Special:Translate tool does not use the correct IP and User-Agent in the CheckUser tool
Medium 6.9
CVE-2025-62697
Improperly sanitized style parameter in LanguageSelector
High 8.8

Affected Vendor

The Wikimedia Foundation

View all reports →

Affected Software

Mediawiki - ExternalGuidance
Vulnerable Versions:
master

Timeline

Official Publish: October 20th, 2025
Last Modified: October 20th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact