 Eiji Kitamura [X](https://twitter.com/agektmr) [GitHub](https://github.com/agektmr) [Mastodon](https://infosec.exchange/@agektmr) [Bluesky](https://bsky.app/profile/agektmr.com)
To provide smooth, in-context authentication across multiple domains,
organizations often embed sign-in pages within iframes. However, loading
authentication contexts inside third-party frames exposes users to critical
threats like clickjacking (UI redressing) and unauthorized credential creation.
To mitigate these risks, browsers disable WebAuthn in cross-origin iframes by
default. Safely lifting this restriction requires active,
[defense-in-depth](https://en.wikipedia.org/wiki/Defense_in_depth_(computing))
protocols.
## Identify threat models
Before enabling passkeys (WebAuthn) inside subframes, understand the abuse
scenarios you are defending against:
- **Tracking using hidden iframe injection:** An attacker triggers a WebAuthn prompt from their own domain using an ad or widget on a trusted site, tricking users into authorizing a passkey without seeing the context. This links the user's identity to an attacker-controlled account to harvest data.
- **Visual overlay and clickjacking (UI redressing):** A malicious parent page renders the authentication iframe invisible using standard CSS and overlays a fake UI element to steal a click that triggers an authentication flow. This can result in session hijacking or forced unauthorized actions if the user inadvertently completes the prompt.
To counter these threats, follow these best practices:
For the top-level document (top frame):
- [Enable delegation using Permissions Policy](https://web.dev/articles/webauthn-within-iframe.md.txt#enable-delegation-using-permissions-policy)
For the embedded document (iframe):
- [Enable partitioned third-party cookies](https://web.dev/articles/webauthn-within-iframe.md.txt#enable-partitioned-third-party-cookies)
- [Guard the endpoint with Content Security Policy](https://web.dev/articles/webauthn-within-iframe.md.txt#guard-the-endpoint-with-content-security-policy)
- [Trust, but verify server-side](https://web.dev/articles/webauthn-within-iframe.md.txt#trust-but-verify-server-side)
For both documents:
- [Secure session establishment using postMessage()](https://web.dev/articles/webauthn-within-iframe.md.txt#establish-sessions-securely-using-postmessage)
## Enable delegation using Permissions Policy
Browsers block access to [WebAuthn](https://www.w3.org/TR/webauthn-3/) in
cross-origin iframes by default. [Permissions
Policy](https://developer.chrome.com/docs/privacy-security/permissions-policy)
is the unified web platform mechanism that lets a top-level document explicitly
delegate these powerful capabilities to specific, trusted third-party origins.
### Feature tokens
WebAuthn uses two distinct tokens:
- `publickey-credentials-get`: Grants authorization for passkey sign-in flows (`navigator.credentials.get()`).
- `publickey-credentials-create`: Grants authorization for passkey registration flows (`navigator.credentials.create()`).
### Requirements for enablement
Enabling these capabilities requires alignment in both the parent server
response and the client-side markup:
- [**Permissions-policy HTTP response header (parent server
site)**](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Permissions-Policy/publickey-credentials-get): The parent page must declare the allowed origins in its HTTP response headers using [Structured
Fields](https://datatracker.ietf.org/doc/html/rfc8941) syntax.
```console
Permissions-Policy: publickey-credentials-get=(self "https://embedded-auth.example.com")
```
**Permissions Policy: publickey-credentials-get compatibility:**
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Permissions-Policy/publickey-credentials-get)
**Permissions Policy: publickey-credentials-create compatibility:**
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Permissions-Policy/publickey-credentials-create)
- **The HTML `allow` attribute:** In the HTML markup, the `
```
**iframe allow="publickey-credentials-get" compatibility:**
Browser Support
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- ' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-color='%2324a5f3' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%231e8ceb' /%3E%3C/radialGradient%3E%3CradialGradient id='s-j' cx='109.3' cy='13.8' r='93.1' gradientTransform='matrix(-.02 1.1 -1.04 -.02 137 -115)' xlink:href='%23s-b'%3E%3Cstop offset='0' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235488d6' stop-opacity='0' /%3E%3Cstop offset='1' stop-color='%235d96eb' /%3E%3C/radialGradient%3E%3C/defs%3E%3Crect width='220' height='220' x='22' y='-107' fill='url(%23s-a)' ry='49' transform='matrix(.57 0 0 .57 187 256)' /%3E%3Cg transform='translate(194 190)'%3E%3Ccircle cx='67.8' cy='67.7' fill='url(%23s-c)' paint-order='stroke fill markers' r='54' /%3E%3Ccircle cx='-69.9' cy='69.3' fill='url(%23s-i)' transform='translate(138 -2)' r='54' /%3E%3C/g%3E%3Cellipse cx='120' cy='14.2' fill='url(%23s-j)' rx='93.1' ry='93.7' transform='matrix(.58 0 0 .58 192 250)' /%3E%3Cg transform='matrix(.58 0 0 .57 197 182)'%3E%3Cpath fill='%23cac7c8' d='M46 192h1l72-48-7-9-66 57Z' /%3E%3Cpath fill='%23fbfffc' d='M46 191v1l66-57-7-9-59 65Z' /%3E%3Cpath fill='url(%23s-d)' d='m119 144-7-9 66-57-59 66Z' /%3E%3Cpath fill='%23fb645c' d='m105 126 7 9 66-57-1-1-72 49Z' /%3E%3C/g%3E%3Cpath stroke='%23fff' stroke-linecap='round' stroke-miterlimit='1' stroke-width='1.3' d='m287 278 3-2m-12-17 8-2m-8-3h4m-4-13 8 2m-8 3h4m-1-13 7 3m-4-11 7 4m-2-11 6 6m0-12 6 7m1-11 4 6m4-10 3 7m5-9 2 7m15-7-1 7m10-5-3 7m11-4-4 7m11-2-5 6m16 7-7 4m10 4-7 3m10 6-8 1m8 16-8-2m5 10-7-3m4 11-7-4m2 11-6-5m0 11-5-6m-2 11-4-7m-4 11-3-8m-6 10-1-8m-16 8 2-8m-10 5 3-7m-11 4 4-7m-11 2 5-6m-8 3 3-3m4 8 2-3m5 8 2-4m6 7 1-4m8 5v-4m8 4v-4m9 3-1-4m9 1-2-4m9 0-2-4m9-2-3-3m8-4-3-2m8-5-4-2m7-6-4-1m5-8h-4m4-8h-4m3-9-4 1m1-9-4 2m-1-9-3 2m-2-9-3 3m-4-8-2 3m-5-8-2 4m-6-6-1 3m-8-5v4m-8-4v4m-9-2 1 3m-9 0 2 3m-9 1 2 3m-9 2 3 3m-8 4 3 2m-8 5 4 2m-7 6 4 1m-4 25 4-1m-2 5 7-3m-6 7 4-2m-2 6 7-4m-13-21h8m41-41v-8m0 99v-8m49-42h-8' transform='translate(-65 8)' /%3E%3C/svg%3E)
## Enable partitioned third-party cookies
To ensure a reliable authentication flow, a session must be established and
maintained within the embedded cross-origin iframe. As modern browsers
transitioned to strict third-party cookie restrictions, standard persistence
mechanisms are often blocked by default and might require calling the [Storage
Access API](https://developer.mozilla.org/docs/Web/API/Storage_Access_API) to
gain access.
To mitigate these obstacles, configure your session cookies with the `SameSite:
None`, `Secure`, and `Partitioned` attributes. This unified platform mechanism
ensures persistent state within the iframe while respecting browser-level
privacy controls.
### Set `SameSite: None`
[`SameSite:
None`](https://privacysandbox.google.com/cookies/basics/cookie-attributes#samesite)
explicitly marks a cookie for cross-site access, letting it be sent with
requests made from a third-party context (like an iframe). This attribute is a
prerequisite for cookies to be functional in cross-origin scenarios, though it
must be combined with the `Secure` attribute to be accepted by modern browsers.
### Set `Partitioned`
The `Partitioned` attribute opts the cookie into [CHIPS (Cookies Having
Independent Partitioned
State)](https://developer.mozilla.org/docs/Web/Privacy/Guides/Privacy_sandbox/Partitioned_cookies),
letting the cookie be stored separately for each top-level site. This ensures
the cookie remains accessible within the specific third-party iframe context,
enabling persistent session state without enabling cross-site tracking. The user
will have to sign in again for each embed on a different site.
## Guard the endpoint with Content Security Policy
While Permissions Policy determines if your iframe *can* run WebAuthn, [Content
Security Policy (CSP)](https://web.dev/articles/strict-csp) determines *who* is allowed to host
your iframe.
For an authentication endpoint, it is critical to ensure that only authorized
partner sites or your own properties can load the login subframe, shutting down
unauthorized clickjacking attempts before they can even load the UI.
### Use `frame-ancestors`
The [`frame-ancestors`
directive](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/frame-ancestors)
defines the valid parent pages that can embed your site. By adding domains to
this directive, you can permit the domains that are allowed to embed the
login subframe.
```console
Content-Security-Policy: frame-ancestors 'self' https://parent-site.example.com;
```
**Content Security Policy: frame-ancestors compatibility:**
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/frame-ancestors)
### Set `X-Frame-Options`
The legacy `X-Frame-Options` header supports similar capability, but only
supports binary options (`DENY` or `SAMEORIGIN`). Set both CSP `frame-ancestors`
and `X-Frame-Options: DENY` in case the browser doesn't support CSP. CSP is
always prioritized where it is supported.
```console
X-Frame-Options: DENY
```
**X-Frame-Options compatibility:**
Browser Support
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[Source](https://developer.mozilla.org/docs/Web/HTTP/Reference/Headers/X-Frame-Options)
> [!NOTE]
> **Note:** You might consider using the [Intersection Observer
> API](https://web.dev/articles/intersectionobserver-v2) to protect against clickjacking as well. This will be the second layer protection on top of CSP `frame-ancestors` and `X-Frame-Options: DENY`.
## Trust, but verify server-side
The browser's client-side checks evaluate intent and permissions, but the server
is the ultimate arbiter of trust. Verify the response on the Relying Party (RP)
server to ensure the context is valid and signed.
### Client-data payload
WebAuthn client data includes parameters specifically designed to help you
verify the context of a request made within an iframe:
- `crossOrigin` (boolean): Indicates if the WebAuthn API was invoked inside a cross-origin iframe. If your architecture relies on iframes, your server *must* enforce that this flag is `true`.
- `topOrigin` (string): The origin of the top-level browsing context (what is visible in the browser's address bar). The server *must* verify this against a list of known, authorized parent origins.
### Verification checklist
To verify the authenticator response on your server, perform the following
steps:
1. Parse and decode the signed `collectedClientData` from the authenticator response.
2. Ensure the `type` matches the ceremony (`webauthn.get` or `webauthn.create`).
3. Verify user presence and signature.
4. If the request was intended to come from an iframe structure:
- Enforce `crossOrigin === true`.
- Enforce that `topOrigin` matches your authorized list of parent origins.
> [!CAUTION]
> **Caution:** Safari doesn't support the `topOrigin` parameter as of May 2026. Even if you skip this verification, you can still maintain security by enforcing the parent context using the CSP `frame-ancestors` directive.
> [!CAUTION]
> **Caution:** Verify your server-side implementation to ensure cross-origin session validation is supported including the library you rely on.
## Establish sessions securely using `postMessage()`
To establish a session reliably, the iframe must pass the authentication token
back to the parent page using `postMessage()`, letting the parent manage the
session state in its own first-party context.
### Secure workflow
To establish a secure session, follow this workflow:
1. Ensure the iframe `src` URL contains a `nonce` and `origin` query parameters:
- Use a random value for the `nonce`. A `nonce` serves as a security verification token to ensure that the authentication token received from an iframe legitimately matches the specific session initiated by the parent page.
- Use the parent frame domain for the `origin`. An `origin` parameter specifies the origin of the parent page, enabling the iframe to securely identify the authorized context in which it has been embedded.
2. The iframe completes WebAuthn authentication with its own server.
3. The iframe server issues a token such as a [JWT](https://jwt.io) that
includes the `nonce` and forwards to the parent page.
```javascript
// Extract nonce and origin from the URL params
const urlParams = new URLSearchParams(window.location.search);
const nonce = urlParams.get('nonce');
const origin = urlParams.get('origin');
if (!nonce || !origin) {
alert('Nonce or origin is missing in the URL');
return;
}
// Create a JWT
const response = await post('/createToken', { nonce, origin });
const token = response.token;
// Post the JWT to the parent frame
window.parent.postMessage({ token }, origin);
```
4. The parent page listens for the `message` event, validates the sender
origin, and verifies the token.
```javascript
window.addEventListener("message", (event) => {
if (event.origin !== "https://embedded-auth.example.com") return;
// Verify the received JWT
const result = await post('/verifyIdToken', {
token: event.data.token,
origin: provider.origin,
});
});
```
5. The parent page persists the session if the JWT is successfully verified.
The sender and receiver both share security responsibilities:
- **The Sender (iframe):** Always specify a strict target origin when sending messages (never use `"*"`).
- **The Receiver (parent):** Always verify `event.origin` when receiving messages to prevent origin spoofing.
## Conclusion
Safe iframe usage hinges on Permissions Policy for enablement, CSP for
restriction, partitioned third-party cookies for session persistence,
server-side verification of client context, and context-aware session handoff
using `postMessage()`.
To learn more about related topics, follow [Google's Chrome developer
blog](https://developer.chrome.com/blog) and explore more resources at the
[Chrome Developer Identity documentation](https://developer.chrome.com/docs/identity).