[webauthn] Merged Pull Request: Forbid authenticator data from containing cleartext PRF outputs

emlun has just merged emlun's pull request 2372 for https://github.com/w3c/webauthn:

== Forbid authenticator data from containing cleartext PRF outputs ==
Closes #2359.

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The following tasks have been completed:

- ~~[ ] Modified Web platform tests ([link](https://github.com/web-platform-tests/wpt/))~~ N/A - abstract requirement

Implementation commitment:

- ~~[ ] WebKit ([link to issue](https://bugs.webkit.org/))~~ N/A - abstract requirement
- ~~[ ] Chromium ([link to issue](https://issues.chromium.org/issues/new?component=1456855&template=0))~~ N/A - abstract requirement
- ~~[ ] Gecko ([link to issue](https://bugzilla.mozilla.org/home))~~ N/A - abstract requirement

Documentation and checks

- [x] Affects privacy
- [x] Affects security
- ~~[ ] Updated explainer ([link](https://github.com/w3c/webauthn/wiki))~~ N/A - abstract requirement


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<a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/pull/2372.html" title="Last updated on Dec 10, 2025, 8:52 PM UTC (5481e3b)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/webauthn/2372/33f5b27...5481e3b.html" title="Last updated on Dec 10, 2025, 8:52 PM UTC (5481e3b)">Diff</a>

See https://github.com/w3c/webauthn/pull/2372


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Received on Wednesday, 8 April 2026 18:46:11 UTC