CVE-2026-103440
Received Received - Intake

Information Disclosure in MediaWiki PageTriage Extension

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: wikimedia-foundation

Description
Exposure of sensitive information through data queries vulnerability in The Wikimedia Foundation MediaWiki PageTriage extension allows Information Elicitation. This issue affects MediaWiki PageTriage extension: 1.46, 1.45, and 1.43.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-09-30
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-103440
EUVD
EUVD-2026-90212

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
the_wikimedia_foundation mediawiki_pagetriage 1.46
the_wikimedia_foundation mediawiki_pagetriage 1.45
the_wikimedia_foundation mediawiki_pagetriage 1.43

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-202 When trying to keep information confidential, an attacker can often infer some of the information by using statistics.

Attack-Flow Graph

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Executive Summary

This vulnerability in the MediaWiki PageTriage extension allows exposure of sensitive information through data queries. Specifically, the pagetriagelist API unintentionally reveals usernames of suppressed reviewers. The API hides suppressed page creators but fails to redact suppressed reviewer names, exposing them via fields like reviewer, reviewer_user_page, and reviewer_user_page_url.

Detection Guidance

Check MediaWiki PageTriage extension versions 1.46, 1.45, or 1.43 for the vulnerability. Query the pagetriagelist API with a page ID to see if suppressed reviewer usernames are exposed in fields like reviewer, reviewer_user_page, or reviewer_user_page_url.

Impact Analysis

An anonymous user can exploit this by querying the API with a page ID to retrieve suppressed reviewer usernames and profile links without authentication. This bypasses MediaWiki's privacy protections for suppressed accounts, posing a privacy risk to affected reviewers.

Mitigation Strategies

Update MediaWiki PageTriage extension to the patched versions (REL1_43, REL1_45, REL1_46, or master) to ensure suppressed reviewer names are no longer exposed. Apply the security patches deployed during the security window.

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