SameSite cookies
Restricts when cookies are attached to cross-site requests.
Support in current browsers
Checked against the current browser versions recorded in MDN browser data 8.0.7.
| Browser | Minimum | Outcome | Reason |
|---|---|---|---|
| Chrome | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Edge | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox | 152 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Safari | 26.5 | Works with limits | Every required mapped feature is available, but BCD records one or more qualifications. |
| Chrome for Android | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Firefox for Android | 152 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Safari on iOS | 26.5 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Android WebView | 150 | Works | Every required mapped BCD feature is available without a recorded qualification. |
| Samsung Internet | 29.0 | Works | Every required mapped BCD feature is available without a recorded qualification. |
What this feature can and cannot do
Helps protect against
- Cross-site request forgery
- Unnecessary cross-site cookie exposure
Does not guarantee
- Same-site request forgery
- Cross-site scripting
- Authentication and authorisation design
What you need before using it
- Explicit cookie classification
- Secure transport for SameSite=None
Fallback to keep in place
Use CSRF tokens, origin validation, Secure cookies, and ordinary authorisation checks.