Whisper Leak: Side-Channel Attack on LLMs Exposed

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Whisper Leak: Side-Channel Attack on LLMs Exposed

First seen 2 Dec 2025, 18:33 UTC • •7.3

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ThreatCluster •March 12, 2026 at 13:27 UTC

Microsoft has identified a side-channel attack, termed 'Whisper Leak', that enables attackers to deduce the conversation topics of language models, even when communications are encrypted. This vulnerability affects users relying on end-to-end encryption for secure interactions with chatbots.

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2 entities, 1 inferred relationships (STIX 2.1).

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Technique (2)

Data Breach
Man-in-the-Middle

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Data Breach related to Man-in-the-Middle

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