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CVE-2026-103440 is a sensitive-information exposure vulnerability in the Wikimedia Foundation MediaWiki PageTriage extension. Vulnerable data queries can disclose sensitive information, enabling information elicitation. Affected versions are PageTriage 1.46, 1.45, and 1.43.
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What an attacker gets, and what they’ve been doing with it.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This two-file repository contains a Python proof of concept for CVE-2026-103440, an information-disclosure issue in the MediaWiki PageTriage extension. README.md documents the affected pagetriagelist API behavior, test prerequisites, and references. poc.py accepts a numeric page ID and API URL, validates that the URL uses HTTP(S) with localhost or a loopback IP address, then issues an unauthenticated GET request with action=pagetriagelist, page_id, and format=json. The returned JSON is printed for inspection. The proof of concept is deliberately constrained to local targets and is read-only; its capability is limited to demonstrating potential disclosure of suppressed reviewers' usernames and profile links when an applicable PageTriage review record exists.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.