{"items":[{"id":"NVI-00003647","kind":"vulnerability","title":"Webauthn has a User Verification Downgrade via Default-Open ClientOverridePolicy","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-h4fw-6r7f-w494"],"plain_summary":"OSV carries this publisher advisory for web-auth/webauthn-framework. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 5.3.1 for web-auth/webauthn-framework. Confirm the publisher’s latest guidance.","source_ids":["sr-460aef59df6af15045f50ba7a6407a87"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-460aef59df6af15045f50ba7a6407a87","url":"https://github.com/advisories/GHSA-h4fw-6r7f-w494","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-h4fw-6r7f-w494","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.424Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-460aef59df6af15045f50ba7a6407a87"],"technology":"web-auth/webauthn-framework","known_exclusions":[],"conditions_summary":"## Summary\n\nIn version 5.3.0 of the Symfony bundle, `Webauthn\\Bundle\\Policy\\ClientOverridePolicy` defaulted to allowing all client overrides, including `userVerification`. A client could send `{\"userVerification\": \"discouraged\"}` in the assertion or attestation options request to override a server-configured `userVerification: required`, causing the emitted WebAuthn options to instruct the authenticator to skip user verification. The `CheckUserVerification` ceremony step then read the same downgraded options and skipped its check.\n\n## Affected versions\n\n- **Vulnerable**: 5.3.0\n- **Patched**: 5.3.1\n\n5.3.0 was released on 2026-05-01 and 5.3.1 was published roughly 18 hours later, on 2026-05-02. Practical exposure window was minimal.\n\n## Note on earlier 5.x versions\n\nVersions 5.0.0 to 5.2.x did not ship `ClientOverridePolicy` (introduced in 5.3.0), so the exact code path described above does not apply. However, on those versions the `ProfileBasedRequestOptionsBuilder` and `ProfileBasedCreationOptionsBuilder` already passed the client-supplied `userVerification` value directly to the options factory, where the profile value is only applied via `??=`. The functional outcome (a client ca","public_affected_ranges":["ECOSYSTEM: introduced 5.3.0; fixed 5.3.1"]}],"null_published_at":"2026-10-31T22:12:48.025Z","source_updated_at":"2026-05-07T21:18:48.987Z","source_disclosed_at":"2026-05-07T21:05:33.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:20.424Z"}],"next_cursor":null,"snapshot_revision":"42594"}