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Low, CVSS 2.3

webauthn-rs-core/webauthn-authenticator-rs: Origin validation mismatch possible when subdomains are allowed

GHSA-22w3-693w-x895

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (webauthn-rs-core 0.6.1-dev, 0.5.5; webauthn-authenticator-rs 0.6.1-dev, 0.5.5), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
2.3 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary webauthn-rs-core ([Relying Party][rp]) and webauthn-authenticator-rs ([client][]) checked that [an Origin in CollectedClientData][origin] is valid for [an RP ID][rpid] with [str::endswith()][ends-with], [without checking for a dot (.) before the RP ID when allowing subdomains][registerable-suffix]. This check is flawed, and could allow requests from an attacker-controlled domain such as hermit-crab.example to be accepted for the RP ID crab.example (assuming .example was publicly-registerable TLD) when the RP allows authenticating from a subdomain (disabled by default in webauthn-rs-core and webauthn-rs). [registerable-suffix]: https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to [ends-with]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.endswith [client]: https://www.w3.org/TR/webauthn-3/#client [rp]: https://www.w3.org/TR/webauthn-3/#relying-party [rpid]: https://www.w3.org/TR/webauthn-3/#rp-id [origin]:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-22w3-693w-x895

Agent brief

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# Patch Next advisory brief: GHSA-22w3-693w-x895

Advisory: webauthn-rs-core/webauthn-authenticator-rs: Origin validation mismatch possible when subdomains are allowed
IDs: GHSA-22w3-693w-x895
Record: https://patchnext.com/advisories/ghsa-22w3-693w-x895 (revision 1, source checked 26 Oct 2026, 15:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: webauthn-rs-core 0.6.1-dev, 0.5.5; webauthn-authenticator-rs 0.6.1-dev, 0.5.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io webauthn-rs-core: affected <= 0.5.4; >= 0.6.0-dev, <= 0.6.0-dev; fixed in 0.6.1-dev, 0.5.5
- crates.io webauthn-authenticator-rs: affected >= 0.6.0-dev, <= 0.6.0-dev; <= 0.5.4; fixed in 0.6.1-dev, 0.5.5

## Suggested inspection (read-only)
- crates.io webauthn-rs-core: check the installed version with your package manager.
- crates.io webauthn-authenticator-rs: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on webauthn-rs-core, webauthn-authenticator-rs.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-22w3-693w-x895 (GitHub-reviewed advisory GHSA-22w3-693w-x895 lists affected ranges: crates.io webauthn-rs-core >=0 =0.6.0-dev =0.6.0-dev =0 <=0.5.4)

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