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    Whether domain fronting constitutes a vulnerability depends on your threat model. Historically, major hosts turned a blind eye to it. This did eventually change, probably in part due to the ACME TLS-SNI vulnerability (this, despite ACME TLS-SNI being blocked once the vulerability was discovered). Commented Nov 13, 2024 at 15:40
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    @Brian yes, I took an educated guess that for OP's threat model, being able to access the mTLS host with a non-mTLS connection constituted a vulnerability. For many common setups this isn't a plausible scenario. Commented Nov 14, 2024 at 9:41