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CVE-2026-103442 is an external control of system or configuration setting vulnerability in the Wikimedia Foundation MediaWiki CentralAuth extension. The flaw allows code injection. Affected releases are CentralAuth versions 1.46, 1.45, and 1.43.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This two-file repository contains a README and a standalone Python 3 PoC for CVE-2026-103442, an authenticated CentralAuth MergeAccount object-injection issue. poc.py uses only Python standard-library HTTP, cookie, compression, parsing, and IP-address modules. It explicitly rejects non-loopback base URLs, logs into MediaWiki through /w/api.php, requests Special:MergeAccount, and extracts hidden form fields and a browser-provided merge session key. It generates a password whose compressed serialized form is the same length as a compressed PHP object payload, allowing it to use XOR relationships to calculate a replacement wpMergeSessionKey. The forged MergeAccount dryrun request causes the decoded state to contain a Guzzle FileCookieJar object configured with a chosen filename. Successful exploitation is evidenced by creation of the marker file, which the script then deletes. The repository is a functional local-validation exploit rather than a detection-only script or a full RCE implementation.
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