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CVE-2026-96872 is an improper access-control vulnerability in the Wikimedia Foundation MediaWiki WikiLambda extension before version 1.47.0 on Linux, macOS, and Windows. The extension improperly handles insufficient permissions or privileges, allowing functionality to be accessed without being properly constrained by applicable access-control lists.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This two-file repository contains a Python proof of concept and supporting README for CVE-2026-96872, an authorization bypass in the MediaWiki WikiLambda extension before 1.47.0. The PoC first queries the supplied MediaWiki api.php endpoint to verify that WikiLambda is enabled. It then starts a local threaded HTTP capture service bound to 127.0.0.1 on port 4020 by default, submits a rejected control wikifunctions_run request, and submits a second crafted Z825 request containing nested ZObject function data and unsaved Python source. On a vulnerable target configured to use the local capture server as its orchestrator, the nested request is forwarded despite the unsaved-code restriction. The script verifies forwarding and the random harmless source marker. The repository is a controlled validation PoC, not a host-RCE exploit: it neither executes system commands nor establishes that the evaluator's WASM isolation can be escaped.
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