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CVE-2026-30691 is a cross-site scripting vulnerability in @cyntler/react-doc-viewer version 1.17.1. The issue is in the TXTRenderer component, which fails to sanitize rendered .txt file content and explicitly casts raw file data as a ReactNode. As a result, attacker-controlled content embedded in a crafted .txt file can be rendered in a way that leads to execution of arbitrary JavaScript in the consuming application's browser context.
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