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Lab 140 — Pressboard — XXE via RSS Feed Import

hackadvisor

Task: Pressboard CMS has an RSS feed import feature that fetches and parses external XML using lxml with default settings. Solution: Crafted a malicious RSS XML with an XXE payload referencing file:///root/flag.txt, hosted it on the internal Interaction Server, and imported it — the flag appeared as an article title.

$ ls tags/ techniques/
xxe_file_readexternal_entity_injectionrss_feed_import_abuse

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